Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaf5010ba0e3d8b6…

MALICIOUS

PDF

70.8 KB Created: 2021-06-06 02:07:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 6dbeea615dcf0ac59fc90c66bea6b656 SHA-1: baa2c0f264ce220f1410174ec48b9101bc66707c SHA-256: aaf5010ba0e3d8b6be015d45b414aa7401b8401e5c45afe7de3218f03e9a804f
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 0.9960

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://smidgel.ru/pbw?utm_term=comptia+server%252B+certification+guide+pdf PDF link annotation
    • https://javimitama.weebly.com/uploads/1/3/4/3/134349319/nokivofujule.pdfIn PDF document text
    • https://mujunuduxur.weebly.com/uploads/1/3/5/3/135327440/gofeb.pdfIn PDF document text
    • https://vidufatow.weebly.com/uploads/1/3/1/4/131438098/e63cd8b586a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410222/normal_60126368c8356.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425230/normal_60396bdc1f2f6.pdfIn PDF document text
    • https://rejomopoxe.weebly.com/uploads/1/3/1/3/131383333/7296189.pdfIn PDF document text
    • https://zulujiporanaru.weebly.com/uploads/1/3/4/5/134590758/redonivubodi.pdfIn PDF document text
    • https://belifexemanugo.weebly.com/uploads/1/3/6/0/136051541/6037530.pdfIn PDF document text
    • https://tawurinerumirun.weebly.com/uploads/1/3/4/6/134648739/2994991.pdfIn PDF document text
    • https://marizezibafive.weebly.com/uploads/1/3/4/8/134865590/7000160.pdfIn PDF document text
    • https://gomisixazu.weebly.com/uploads/1/3/1/4/131437427/zenakoma_vujowis_sipipiwu.pdfIn PDF document text
    • https://gitapobukelagij.weebly.com/uploads/1/3/4/2/134266265/7421a9236b484.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465688/normal_5fc9a6199a10e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474722/normal_6014023327973.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jabodawo.pbworks.com/w/file/fetch/144617697/vifogisibiwa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bb973cd-6ed6-446c-b446-3a91e56c50cd/ponniyin_selvan_audio_book_in_tamil_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed7cc066-aace-499c-97d7-a6724a6e5524/12106785036.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53889acb-f4bf-4c7d-a7c4-810836d37609/25_hp_johnson_outboard_motor_weight.pdfIn PDF document text
    • http://vikiruji.pbworks.com/f/difujenoxajelipobinamo.pdfIn PDF document text
    • http://bepisoxu.pbworks.com/w/file/fetch/144435720/17436365609.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0327f2c-251e-42c9-899d-70fd4aa5a766/what_communication_style_is_required_in_this_type_of_situation.pdfIn PDF document text
    • http://jolowajuwijo.pbworks.com/f/tixidad.pdfIn PDF document text
    • http://ritijix.pbworks.com/f/59624956363.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4514832f-1825-4590-ac55-558a5397ce9e/pazivajunaxurig.pdfIn PDF document text
    • http://noxiwako.pbworks.com/f/mafijodomesokuzigakezafup.pdfIn PDF document text
    • http://nubuzefi.pbworks.com/w/file/fetch/144591270/how_to_pair_monster_fm_transmitter.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_off0000d750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD750 5408 bytes
SHA-256: f6e3e4a5afaad99fe0a4d8722316b131194aaf39486ceb3c2138dc81e451a25c
font_01_sfnt_off0000e9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A1 10408 bytes
SHA-256: 5e90ba1895a5731e2d0f251be0f93d531d5620486f3d5a6e4707e1ad6655add1