Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf567b688145dc41…

MALICIOUS

PDF

85.9 KB Created: 2021-03-24 02:04:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c4dc6ea4b0ff964dd1b25260f0e2e614 SHA-1: 951c5c5a6b8341769aefca1479452541106f0144 SHA-256: bf567b688145dc4197f88fa88815c618e47cc51d08333762a11b22f6b62fe4dc
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://xajibur.ru/wix?keyword=download+mx+player+pro+apkpure PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4461751/normal_602814de30ee1.pdfIn PDF document text
    • https://jevamupoledi.weebly.com/uploads/1/3/4/7/134712268/vanitabixiwimizil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417808/normal_6031f7852d1e5.pdfIn PDF document text
    • https://kigolaris.weebly.com/uploads/1/3/1/3/131380971/cfb09e68d60a7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376120/normal_601ee9fdbb799.pdfIn PDF document text
    • https://kagodititaf.weebly.com/uploads/1/3/4/8/134868324/9546241.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454977/normal_605675b60e737.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484834/normal_5fd14842201aa.pdfIn PDF document text
    • http://shtangelkipokupkiitd.online/901350726390wj27.pdfIn PDF document text
    • http://rivalo130.com/ibn_arabi_society_youtubeuz9dk.pdfIn PDF document text
    • http://pimebujeben.66ghz.com/97956221935.pdfIn PDF document text
    • https://faxasuxudoxo.weebly.com/uploads/1/3/2/6/132695360/molij.pdfIn PDF document text
    • https://tupuzenetuz.weebly.com/uploads/1/3/4/5/134519332/rivumabemozek.pdfIn PDF document text
    • https://bubokadorododu.weebly.com/uploads/1/3/4/7/134758236/2338401.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461484/normal_604a57fd7cc87.pdfIn PDF document text
    • http://kudatikixobulan.22web.org/jupumibuvusowa.pdfIn PDF document text
    • https://pedigibija.weebly.com/uploads/1/3/1/8/131857049/pazoxaxisotod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383806/normal_60252b81b4883.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nadefivetokilak.rf.gd/the_forgotten_books_of_eden_complete_edition.pdfIn PDF document text
    • http://jaterivi.epizy.com/how_to_use_phonemic_awareness_in_the_classroom.pdfIn PDF document text
    • http://filipebed.rf.gd/plantronics_headset_cs530_instructions.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
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31E 5252 bytes
SHA-256: d86c211da8c2da28eb0f7b32662614bb00cb47cffec8ea360ea072186f66da0a
font_01_sfnt_off000104fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FE 1776 bytes
SHA-256: ce00980ae728a55c66681e8c174deb88c31e2ffb05911903f5b1ec7642a63778
font_02_sfnt_off00010daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAF 11352 bytes
SHA-256: eb641ea4ab8033b123fa13460c2beefee75898fbc866e8037e9888ed9a292338
font_03_sfnt_off00013498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13498 16128 bytes
SHA-256: ffaffd51b34263f512d75298e54d80ec2a59453393ad05d832ceb25ed0b3cd63