Malicious PDF — malware analysis report

Static analysis result for SHA-256 b79e083c28b8c724…

MALICIOUS

PDF

72.0 KB Created: 2021-02-27 04:27:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 3507a805b6bf44a1cfbaafb97f6798ec SHA-1: bbf37a9a2e15d1b3ab59e4c47a1e5e8614879f51 SHA-256: b79e083c28b8c72465196788dab865ce4d3d9a524f834e6c4c5e1f9f0fdec879
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs, including one that appears to be a lure for 'chamberlain college of nursing send transcripts'. The PDF is also flagged as a link farm on disposable hosting and detected as a phishing trojan by ClamAV. While no scripts were explicitly extracted, the presence of external links and the phishing lure strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://kuzutuzo.ru/wix?keyword=chamberlain+college+of+nursing+send+transcripts PDF link annotation
    • http://tinabubolapab.iblogger.org/fumigipoporo.pdfIn PDF document text
    • https://cdn.sqhk.co/jotepomi/ahfjehe/47160313742.pdfIn PDF document text
    • http://wilitubejibo.iblogger.org/20539995744.pdfIn PDF document text
    • https://kujibolivobukib.weebly.com/uploads/1/3/1/1/131163991/646b6c2.pdfIn PDF document text
    • https://cdn.sqhk.co/murafabu/phjhiji/wutolimapujuladej.pdfIn PDF document text
    • https://lupofavegevo.weebly.com/uploads/1/3/5/3/135335207/zafewi_rovevajub.pdfIn PDF document text
    • https://cdn.sqhk.co/nezusoxe/gjiiLii/wavixerixi.pdfIn PDF document text
    • https://kurakozizuvev.weebly.com/uploads/1/3/2/6/132681999/xinubojuzejava_dasubesarafuzo_kogebo_marujuwuzomuma.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://liwivudelaje.epizy.com/who_is_afraid_of_virginia_woolf_online_with_subtitles.pdfIn PDF document text
    • https://s3.amazonaws.com/jepavilutabilel/acer_c720p_chromebook_manual.pdfIn PDF document text
    • http://fudojozijenabux.epizy.com/llanas_agudas_esdrujulas_ejercicios.pdfIn PDF document text
    • http://fapibudu.epizy.com/tailoring_enchanting_guide_wotlk.pdfIn PDF document text
    • http://guzumirofega.epizy.com/allegiant_movie_in_tamil.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93F 5612 bytes
SHA-256: f7a4e6f969f2e7733da19f7d6d1ddfed092bc05d457d7535ae9f38359af3948b
font_01_sfnt_off0000ec22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC22 10720 bytes
SHA-256: 819cb36e9fe197f2fb8930f2d3f646a1e2f03a1e5d82d529359741b9154ee027

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