Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5ea8b8cc404289a…

MALICIOUS

PDF

74.2 KB Created: 2021-03-15 11:41:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d3b328549b64918614aeb1afad7edddc SHA-1: 557f03b9703e58f841516edb207e3366d4ef1a63 SHA-256: a5ea8b8cc404289a87045ae099cadd5b14106e97440b3ac403429ce964e97467
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

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://dugedepap.ru/wix?keyword=understanding+earth+7th+edition+macmillan+pdf PDF link annotation
    • http://hiziryigit.online/ellis_jersey_shore_florencen9ahx.pdfIn PDF document text
    • http://maska-respirator.com/duxobigawopipiminet1u.pdfIn PDF document text
    • http://24goodstore.site/721497416363dvd1.pdfIn PDF document text
    • http://dsv-trening.ru/best_norse_mythology_fiction_books280ro.pdfIn PDF document text
    • http://saudiautoinsurance.com/cacao_tree_informationchurd.pdfIn PDF document text
    • http://lnstagram-help-businesss.com/dunowilawezesorabesopukuux72.pdfIn PDF document text
    • http://deweretiwusoxo.22web.org/rinnai_r85_replacement_parts.pdfIn PDF document text
    • http://molosorew.iblogger.org/7358495585.pdfIn PDF document text
    • http://agencymedia-ig.com/xumutejivutizenebaguzhdu8n.pdfIn PDF document text
    • http://sodalabs.pro/nursing_diagnosis_for_diabetes_mellitus_according_to_nandam7xf3.pdfIn PDF document text
    • https://cdn.sqhk.co/fagaxirupunu/iigdov8/break_time_gift_card_balance.pdfIn PDF document text
    • https://cdn.sqhk.co/rularijulen/HhgIifK/18783923861.pdfIn PDF document text
    • http://lalat.space/266753078898e1en.pdfIn PDF document text
    • https://cdn.sqhk.co/pewowutefiw/igHggNP/toverosisu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vadawowugozopul.epizy.com/rosajoguroralure.pdfIn PDF document text
    • http://zefobik.epizy.com/43995893721.pdfIn PDF document text
    • http://fafozega.rf.gd/c_base64_string_to_file.pdfIn PDF document text
    • http://gibonoxemibete.rf.gd/xikarujaweboz.pdfIn PDF document text
    • http://xajejewaf.rf.gd/graduation_diploma_certificate_template.pdfIn PDF document text
    • http://bikumekomem.epizy.com/49744248111.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e43a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43A 5640 bytes
SHA-256: 587b6a398a593cf675b72f8752c19ec20a0644d7c523ad1fc3ee4d92ee66f37b
font_01_sfnt_off0000f74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74A 10476 bytes
SHA-256: 5efd7523d5a3f299c689e4cc06002e7af00a8a2a4715caefe1358ddaaa581811