Malicious PDF — malware analysis report

Static analysis result for SHA-256 b846c09e61722175…

MALICIOUS

PDF

93.0 KB Created: 2021-03-08 20:45:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 27829359e6af6b11e3fbc77571d5d049 SHA-1: d4806523a5f1b9c9fd4ec479d7510769f9eb3ea1 SHA-256: b846c09e617221751e81261edf50c339fdc82eda0190f332b25887bafd6a4c40
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://leonvi.ru/award?keyword=aquaculture+engineering+lekang+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412774/normal_603777d7c6983.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402504/normal_5ff582d82c742.pdfIn PDF document text
    • http://shopmzm.site/what_is_google_workspace_syncnittp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382793/normal_5fd3790a58ca1.pdfIn PDF document text
    • http://item-get.top/16166976369l8wbt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404725/normal_6004c58a61503.pdfIn PDF document text
    • http://mon-cmso.best/panegavumupifu48egw.pdfIn PDF document text
    • http://ttttrrrr.space/bawulolilevizp2are.pdfIn PDF document text
    • http://braco.ru/plants_vs_zombies_2_characters_wiki7tygk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476580/normal_5fd388bf773de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473322/normal_602bb2a91681a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444114/normal_601b26caef00c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384301/normal_5fd60d64d3ee1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394077/normal_60366846774f7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://22449060-8e30-4723-8828-967625cce342.filesusr.com/ugd/eddc50_b03a85fd98ef4bd8854e185d715b0771.pdf?index=trueIn PDF document text
    • https://98cdd5c5-c43e-49eb-9373-39517e896cbb.filesusr.com/ugd/90661f_4a55b04ba29a489085b3e2d53530a6dc.pdf?index=trueIn PDF document text
    • http://nibudomatimemi.rf.gd/38626946161.pdfIn PDF document text
    • http://tunazafagid.epizy.com/14101300860.pdfIn PDF document text
    • https://810dce77-56ab-4324-823a-3549757f4eab.filesusr.com/ugd/1fad07_148c11abe7004548baf2b8012ff611a8.pdf?index=trueIn PDF document text
    • http://wufofot.rf.gd/regowaxelotili.pdfIn PDF document text
    • http://kozirexufogepi.epizy.com/kinetico_water_softeners_manual.pdfIn PDF document text
    • http://walefusariwe.epizy.com/mitijodujab.pdfIn PDF document text
    • https://6a8c3f3f-5248-4e80-80e0-4bf2c04f72bc.filesusr.com/ugd/8b2c09_6c64b0b30fce4b81bd1a0f244c1ecd2e.pdf?index=trueIn PDF document text
    • http://xuvanemesu.rf.gd/how_long_has_les_miserables_been_running_in_london.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010dbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBE 5324 bytes
SHA-256: 94f68767028d7cb8f829cea27a18ac9371d795dc9fbeb1bd23b6ece7bf670cf3
font_01_sfnt_off00011fe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE7 15960 bytes
SHA-256: c93457b71b200c6ab2c3e5cb8a176950dd82ca5e23d3fa6eab616f04d872a09c
font_02_sfnt_off0001517e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1517E 16060 bytes
SHA-256: 5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330