Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a2400bb7f4df7b0…

MALICIOUS

PDF

76.9 KB Created: 2021-03-17 12:56:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a098d38fa69ea1e0a669b2e20c03f938 SHA-1: de2dd6dc14cef258f3dc40d4c1991b8bc9eb2b13 SHA-256: 7a2400bb7f4df7b0a83a19c06cc215a7ce26197f6ee6fb969afad23a69c4a519
186 Risk Score

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 0.9997

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://jumiwimov.ru/wix?keyword=mortal+kombat+x+game+guide PDF link annotation
    • http://fresh-ita.fun/sezurexewavemwyas.pdfIn PDF document text
    • https://vejiledulibona.weebly.com/uploads/1/3/4/3/134318828/vexifivevur_wiwuzibunibabem_nanusukupulat_dobiruparifo.pdfIn PDF document text
    • https://cdn.sqhk.co/gowozepugax/hjugecG/manual_lawn_aerator_canada.pdfIn PDF document text
    • http://kipegujodup.getenjoyment.net/lamedugagekojipomuwufa.pdfIn PDF document text
    • http://vomimaforotagi.mywebcommunity.org/richard_nixon_the_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/kutagigixef/if2Jaid/action_research_proposal_template_for_teachers.pdfIn PDF document text
    • http://vpntop.info/mezezodofisokojogakinesudjter0.pdfIn PDF document text
    • http://toxipoxekej.medianewsonline.com/42852017718.pdfIn PDF document text
    • http://xafawotilujos.mypressonline.com/gosofogapisof.pdfIn PDF document text
    • https://wewiruvikaju.weebly.com/uploads/1/3/0/7/130775929/saxuwagibimuw.pdfIn PDF document text
    • https://cdn.sqhk.co/kusewupudin/hqQgdif/lebavix.pdfIn PDF document text
    • https://losasogewago.weebly.com/uploads/1/3/1/4/131437886/1385919.pdfIn PDF document text
    • https://silemixijotin.weebly.com/uploads/1/3/4/4/134463531/8f90167433d67d5.pdfIn PDF document text
    • https://xarobugogowi.weebly.com/uploads/1/3/4/5/134594165/tovusi.pdfIn PDF document text
    • http://vekisonoloze.sportsontheweb.net/letter_from_birmingham_jail_upenn.pdfIn PDF document text
    • http://nesorus.mywebcommunity.org/calculus_made_easy_thompson_gardner.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5fb42ee6-a9be-400a-98f2-f9d4b9f720c8.filesusr.com/ugd/1813b3_749c3a8b630241bfa43f32ac117f4771.pdf?index=trueIn PDF document text
    • https://952d9f4b-853a-4e85-af28-23c4d489d487.filesusr.com/ugd/8db125_51cf457a589a4663bc02a4b8e874b7a4.pdf?index=trueIn PDF document text
    • https://0e098354-e5d1-4afc-9be7-763a70ae5e44.filesusr.com/ugd/ef253e_c99c2915d4af4e17a7a1c6a405bd864f.pdf?index=trueIn PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_6d4a14cea43345818a318c62221e7aca.pdf?index=trueIn PDF document text
    • http://kubowulurarekij.myartsonline.com/how_much_does_a_new_bobcat_cost.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_off0000f030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF030 5244 bytes
SHA-256: 90b38da7ff332d128672304221f7f56320460d5870da4afeb3609a4b2df6361b
font_01_sfnt_off000101f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F7 10680 bytes
SHA-256: 68e624c7ae85faf6ea8c82f15101e3d6bfad0eb9e99f4a77ad9b078f4429dcdb