Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3f9b0ed3b08b040…

MALICIOUS

PDF

112.4 KB Created: 2021-03-19 10:40:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 73a5284ccbfcd72bd4d137f9d0f74551 SHA-1: ff53ced8970321154bd97c2ff6977959f4fc323b SHA-256: c3f9b0ed3b08b040fbeab2e016e6dd011bdc1e480c1c64357f1b8530fd0f959b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a link farm with numerous external URLs, many hosted on disposable domains, suggesting a phishing or malware distribution attempt. The primary lure appears to be a fake download link for 'Baldur's Gate: Descent into Avernus'. While no scripts were explicitly extracted, the PDF structure and the presence of external links strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://maypoin.ru/award?keyword=baldur+s+gate+descent+into+avernus+free+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375355/normal_5fd254435c3af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461484/normal_6013ece354e59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463533/normal_5fe9c48402213.pdfIn PDF document text
    • http://igonlinesupport.com/15516976006z074k.pdfIn PDF document text
    • http://gedawirij.66ghz.com/55392415060.pdfIn PDF document text
    • http://lavokuladuranab.22web.org/luzufesobaxupiba.pdfIn PDF document text
    • http://mekuwomusaxonod.22web.org/xiaomi_mi_a2_lite_update_android_10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477864/normal_6004dbb7d5fbf.pdfIn PDF document text
    • http://grantmedica.ru/55042438921o3opq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454984/normal_5fe88257c3bac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427103/normal_604ab79ea5027.pdfIn PDF document text
    • http://pro-konditer.com/anuraga_karikkin_vellam_songs_video48nu4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458137/normal_602a5070762c3.pdfIn PDF document text
    • http://mavitorilop.22web.org/46840222678.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414489/normal_6015af084aff9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476146/normal_603ac4147c49f.pdfIn PDF document text
    • http://negeduji.66ghz.com/lirisuwilimimamorala.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392656/normal_6020fa090de55.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://234a0c07-d908-4261-bb83-16b3c96a9b04.filesusr.com/ugd/73e0e6_23d1c0047b284472898410751f6cc1e8.pdf?index=trueIn PDF document text
    • https://a16eeaf1-ab09-4fb7-bdbc-3ebfa24c279d.filesusr.com/ugd/03042f_7de599fe6bd44e5b9427b9ed20b1d587.pdf?index=trueIn PDF document text
    • http://nolawasewunut.epizy.com/does_vizio_m43-c1_have_bluetooth.pdfIn PDF document text
    • http://fepesori.rf.gd/cards_against_humanity_funny_answers.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13780 6440 bytes
SHA-256: a606a6dede3b99472d2ac97761204782646b5f75106b48d1abccbe9a99ca9a4c
font_01_sfnt_off00014774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14774 5524 bytes
SHA-256: bd117ae69c0c4c9f3dca5b6cff78e26081e85f971634ebac02db30f39dbb8060
font_02_sfnt_off00015a5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A5E 5852 bytes
SHA-256: e197c3daed01507d2166f9aa476220777787e91ae28780e40f08fcf4deb9861b
font_03_sfnt_off0001690f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1690F 1852 bytes
SHA-256: ab7952e30a868751faa025f2e14b53a51e83c417853e71d0ae878d8a5e8faa15
font_04_sfnt_off000171e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171E8 12540 bytes
SHA-256: 4c7d927bbad213e5f27331a7f282a62e598794b9ff1ef2a40982d6a49e494970
font_05_sfnt_off00019c6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C6F 16228 bytes
SHA-256: 353aa8a27f19d8f109e3dc6e1b9084ffb8fccdc73bebd944c3d28ef01220ed87

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