Malicious PDF — malware analysis report

Static analysis result for SHA-256 776aa78a75bb2cd4…

MALICIOUS

PDF

84.1 KB Created: 2021-03-04 14:53:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 75fff52130bc2252813149c9698363f1 SHA-1: 764fdb933899a229db025612faa5c0e5ba879556 SHA-256: 776aa78a75bb2cd41964d1e0fc3e8461e259c7cd0887fd99fce0258b0e113dfc
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 hosting services, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains text related to software verification and validation, likely used as a lure to drive traffic to these malicious URLs. ClamAV and ML heuristics confirm the malicious nature of the PDF, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/123?utm_term=what+is+the+difference+between+software+verification+and+validation PDF link annotation
    • https://cdn.sqhk.co/kerutadit/HNgffje/27187364641.pdfIn PDF document text
    • https://tixusevonatafix.weebly.com/uploads/1/3/4/6/134611731/sopexaxexug.pdfIn PDF document text
    • http://exemplpusj.com/antecedent_form_meaning_in_telugu6oa2e.pdfIn PDF document text
    • https://bulugigedi.weebly.com/uploads/1/3/4/7/134714886/girosozagowuwudopiz.pdfIn PDF document text
    • https://cdn.sqhk.co/sajatanugeg/geifjim/action_hero_biju_meme_dialogue.pdfIn PDF document text
    • https://wizujepubenepax.weebly.com/uploads/1/3/5/3/135317151/daa0558886707a.pdfIn PDF document text
    • https://cdn.sqhk.co/sileluzorupo/hcicVys/input_tax_definition_under_gst.pdfIn PDF document text
    • http://fallofelin.online/88663707483pfp3t.pdfIn PDF document text
    • https://femobideja.weebly.com/uploads/1/3/4/7/134735935/3d0e866.pdfIn PDF document text
    • https://bojuwakuxejekur.weebly.com/uploads/1/3/5/3/135347713/momimasalaw_zemedexem_jobapede_xosudelobufepim.pdfIn PDF document text
    • http://musofiron.ru/kosamusuv1t7b.pdfIn PDF document text
    • https://rosunitekuw.weebly.com/uploads/1/3/1/3/131384708/lebisagaw.pdfIn PDF document text
    • https://cdn.sqhk.co/tilafukefuwe/jjjjaXS/nigusezopiradak.pdfIn PDF document text
    • http://detonic-ordina.website/how_do_you_clean_a_shark_navigator_dlx_vacuum8bizp.pdfIn PDF document text
    • https://cdn.sqhk.co/foxoxaze/Figgf8q/45857884882.pdfIn PDF document text
    • https://vesanalu.weebly.com/uploads/1/3/1/4/131482823/wupufebeduma_tibulasegizoba_nelururoxak_jofape.pdfIn PDF document text
    • https://cdn.sqhk.co/nupegefozub/jdZidhg/doodle_jump_download_nokia_3310.pdfIn PDF document text
    • https://cdn.sqhk.co/kunimoxifagi/oifgxhe/novuzitefazaj.pdfIn PDF document text
    • http://instapodarok365.site/23573360604ufsw.pdfIn PDF document text
    • https://cdn.sqhk.co/fedelubu/nidCRwZ/86116940889.pdfIn PDF document text
    • https://wemosixalaku.weebly.com/uploads/1/3/4/3/134315089/kibapapisogenux.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8A 5200 bytes
SHA-256: 44df5b09dd5eae044b65e7adc24edb3784734c34cbe7090180773735cf615739
font_01_sfnt_off00010c42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C42 11328 bytes
SHA-256: ed71691fba4efa9281aa284b9ef1c28e0eb1fe81c3a8ace94ae3f90c29ecd5ec
font_02_sfnt_off00013282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13282 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71