Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3a493687d44a398…

MALICIOUS

PDF

82.2 KB Created: 2021-03-20 20:37:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 7a71f2b8cf44244ad0ce94c9aa5d805f SHA-1: 513c27d1c950c31846576c969f0ee93d6fe7268b SHA-256: a3a493687d44a3985a627cd56a35ec138bf862d7bc3fac3da25223cde2980c36
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9996

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://xezojetit.ru/award?keyword=12th+zoology+practical+book+pdf+english+medium PDF link annotation
    • https://gunajotigur.weebly.com/uploads/1/3/4/7/134738866/299554.pdfIn PDF document text
    • https://pufodafu.weebly.com/uploads/1/3/5/9/135959320/8900643.pdfIn PDF document text
    • http://fajamad.mypressonline.com/global_history_regents_essay_examples.pdfIn PDF document text
    • https://gazezujebek.weebly.com/uploads/1/3/4/8/134881616/luluvewawozan_sofud_mimuniruwo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369190/normal_60221ec48723c.pdfIn PDF document text
    • https://boxoxezerutevok.weebly.com/uploads/1/3/4/3/134317212/pawibumakazuwuwave.pdfIn PDF document text
    • http://woxuruko.medianewsonline.com/blender_animation_basics.pdfIn PDF document text
    • http://jaralet.getenjoyment.net/belajar_bahasa_arab_file.pdfIn PDF document text
    • http://bijowuxupolapi.sportsontheweb.net/86290213032.pdfIn PDF document text
    • https://kurasapar.weebly.com/uploads/1/3/4/9/134902571/d1221.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482219/normal_604b7a5ee0bc7.pdfIn PDF document text
    • https://joralonu.weebly.com/uploads/1/3/1/6/131607047/7056853.pdfIn PDF document text
    • http://lapitubemexidi.mywebcommunity.org/16411389486.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477147/normal_5fd665cf0fb14.pdfIn PDF document text
    • http://gukiduwonaxinef.getenjoyment.net/john_deere_l108_automatic_price.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://satawakerexe.atwebpages.com/doxoka.pdfIn PDF document text
    • http://pumajuxav.rf.gd/nevijivavizalevu.pdfIn PDF document text
    • http://peledopa.myartsonline.com/78631734852.pdfIn PDF document text
    • http://bopamebedozupux.epizy.com/94052161818.pdfIn PDF document text
    • http://gotozorij.epizy.com/what_does_a_medium_sweet_potato_look_like.pdfIn PDF document text
    • http://pelubameta.epizy.com/resekipozarawetad.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE100 6016 bytes
SHA-256: 11434dfd6fb42d05984695f6a74e66ac2b3b856c72e4d837ea747f656d859b04
font_01_sfnt_off0000f564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF564 13760 bytes
SHA-256: ca3ff6eb5e40ad4f001eef63faf845ccfafcb1974f9b54aaed71acb64ed27147
font_02_sfnt_off00011692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11692 10596 bytes
SHA-256: b271f138cbfde671a30f35409c53d6591b84cc1a17387a070a0e48c3294eeccc

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