Malicious PDF — malware analysis report

Static analysis result for SHA-256 42a9ebeffd72bcdb…

MALICIOUS

PDF

82.4 KB Created: 2021-04-06 04:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1ac2a907cb80054a1ca98d99fd0fecab SHA-1: 508d98d444e5b3c3f7be607302e83649aeac2b31 SHA-256: 42a9ebeffd72bcdbef987da6e824683f45c7ff8613fdbe00f09cd77f0854a1c1
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 0.9991

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://mezovuduw.ru/strik?utm_term=how+to+install+govee+wireless+door+chime PDF link annotation
    • https://meligobuv.weebly.com/uploads/1/3/1/0/131070858/kiwagilu_pusuxeze.pdfIn PDF document text
    • https://sukowuxipimo.weebly.com/uploads/1/3/4/3/134318810/seduposiwajakepanedo.pdfIn PDF document text
    • http://rixadixiji.scienceontheweb.net/resignation_letter_sample_doc.pdfIn PDF document text
    • https://xasigusuvenazuj.weebly.com/uploads/1/3/0/7/130739755/vesudavomo-xuwekumowebe.pdfIn PDF document text
    • https://dofudovi.weebly.com/uploads/1/3/6/0/136092117/3a5306faa7d11.pdfIn PDF document text
    • http://midarujiwuvi.mygamesonline.org/bacteriocin_classification.pdfIn PDF document text
    • http://vutunema.mypressonline.com/walmart_tv_65_inch_stand.pdfIn PDF document text
    • https://fezipogapatud.weebly.com/uploads/1/3/4/8/134888370/a93f397deb0266.pdfIn PDF document text
    • https://lopiranurepo.weebly.com/uploads/1/3/4/7/134735856/1537323.pdfIn PDF document text
    • https://topalezomezo.weebly.com/uploads/1/3/4/3/134305389/fufetunesapunu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ea0a6730-5b47-42bc-899c-5b27b21b32ea.filesusr.com/ugd/184298_509a3c7fd26744c881315841080e04c5.pdf?index=trueIn PDF document text
    • https://709e7e89-b264-4d73-b757-064736ed86f1.filesusr.com/ugd/f523c3_edae8763e1d04f4097d9fb506ed7baca.pdf?index=trueIn PDF document text
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_825a04f9f03a48a38519bac4bf24c26f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/90dc63e3-2da6-42fa-8be2-a9b1671d570a/if_i_dont_eat_every_other_day_will_i_lose_weight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd148bb3-7cf5-4e22-ba46-b6ced55ee3ed/gesiv.pdfIn PDF document text
    • https://5e73d190-47a4-4ead-99bf-7e9069f06a16.filesusr.com/ugd/55cc32_3233e1c979154746b6d2f30bff99dba8.pdf?index=trueIn PDF document text
    • https://2b4b9a66-705d-4e40-a31d-28d4db190467.filesusr.com/ugd/1dbb98_ca0f257bf4a04fddb07a3dd1f56134d9.pdf?index=trueIn PDF document text
    • https://e474413f-ff6d-4b46-a00c-d4c33541206b.filesusr.com/ugd/ddecc0_0a9be0168cb7462286b63e5e7845ddb5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/02a1e674-9bb7-49f8-a935-40f462a04b3d/skyworth_led_tv_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1daafa63-2a5c-45c6-bdca-39dd93a21728/28519501056.pdfIn PDF document text
    • https://44f39d5c-a655-4437-91b6-62b11e148e71.filesusr.com/ugd/eb4c03_edac2da885264bc49c5e79ac8eabcd3f.pdf?index=trueIn PDF document text
    • https://52cfbdcc-51c1-4e85-ba83-ad74149b4620.filesusr.com/ugd/93d431_004ffc1875c045b5b720fe979f850a6d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9573399e-4ab0-4365-8b93-4ec4d0a2b9c9/japegodizolunaxidasuwe.pdfIn PDF document text
    • https://02274cc9-8b57-4441-be19-e46c089ec46b.filesusr.com/ugd/f11b8f_17d7ad77f4da4453a89ebc98cb38327b.pdf?index=trueIn 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_off00010189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10189 5464 bytes
SHA-256: 4809aa3af05256aa3b5d02ada17df086a5d678d46a2f2d0f3836cc3554292abd
font_01_sfnt_off0001140c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140C 11140 bytes
SHA-256: ee2c95967349a5464c1d43fa6e287177d6c83dfb76e1e95e3096249098dfbe2c