Malicious PDF — malware analysis report

Static analysis result for SHA-256 c588919af6fcf1ff…

MALICIOUS

PDF

85.2 KB Created: 2021-03-19 20:01:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9ebb1fc943648de397a227ec81bc973e SHA-1: fb3a835efd42f679ca4d1c311b3176625cd2bea8 SHA-256: c588919af6fcf1ff96ff3c1e5f09f1dcedb9d89e1d8fede93657ec07c004c1c0
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 0.9998

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://jacksth.ru/123?utm_term=after+school+activities+worksheets PDF link annotation
    • https://cdn.sqhk.co/xugiwatokax/bXjjgje/nufajip.pdfIn PDF document text
    • https://cdn.sqhk.co/bunigenozav/ShcghyR/does_mosquito_sound_repellent_work.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462697/normal_60385a9b1ee31.pdfIn PDF document text
    • http://parkji5x.xyz/what_are_ephemeral_streamsbg9v4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489057/normal_601b3b20be690.pdfIn PDF document text
    • http://buyervannakupitvsem.xyz/jizikitulagarajulojamh5frw.pdfIn PDF document text
    • https://wopixidotawus.weebly.com/uploads/1/3/4/5/134506387/bexipodakanekopod.pdfIn PDF document text
    • http://tevajevidiwa.22web.org/24874309200.pdfIn PDF document text
    • https://jerolukemotib.weebly.com/uploads/1/3/0/8/130874115/4915269.pdfIn PDF document text
    • https://cdn.sqhk.co/linidivez/XidKugj/minecraft_earth_mobs_texture_pack.pdfIn PDF document text
    • http://organicnu.info/457961895488j52u.pdfIn PDF document text
    • https://cdn.sqhk.co/xasakeza/gpVPjih/danulik.pdfIn PDF document text
    • http://tronreserve.online/dictionary_of_literary_termsa4w4r.pdfIn PDF document text
    • http://doorstepcomputers.com/zifefenogulezowobyasr1.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://fuvituze.epizy.com/keto_diet_shopping_list_uk.pdfIn PDF document text
    • http://pawubiba.epizy.com/how_to_gift_a_shark_card_gta_v.pdfIn PDF document text
    • http://xifonefoje.epizy.com/guzuxajajogi.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_off00010653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10653 4856 bytes
SHA-256: ce0395a88db3dc46622259a11de3f87872014b630e3fceeb7b225c1f30babaf3
font_01_sfnt_off000116fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FA 10164 bytes
SHA-256: 77543189150021d504a7092dcb1ebdeadbd21c25c7763338537ba68a363ca921
font_02_sfnt_off000139a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139A5 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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