Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0bc2cdce77ccd95…

MALICIOUS

PDF

71.8 KB Created: 2021-06-06 14:06:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: aefdb61e6539274aacdc1016c9e230bf SHA-1: 5e840b838037d4fae6b929d4e359d51dd52f30f5 SHA-256: a0bc2cdce77ccd959e5ca23687dccfa4c50bebb15c8f3f4792b7852bcb1ce6b4
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/pbw?utm_term=how+to+put+together+a+bunk+bed+with+stairs PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4378157/normal_5fe5b161a2aed.pdfIn PDF document text
    • https://sowozulame.weebly.com/uploads/1/3/4/7/134733070/wevazisu.pdfIn PDF document text
    • https://dogopakuva.weebly.com/uploads/1/3/4/6/134698139/badudakamaru.pdfIn PDF document text
    • https://tezogikezuvar.weebly.com/uploads/1/3/4/5/134584113/23db40bed05ec1.pdfIn PDF document text
    • https://dawugagulinejud.weebly.com/uploads/1/3/4/3/134368664/b3b324f26942.pdfIn PDF document text
    • https://guxipalun.weebly.com/uploads/1/3/1/8/131857363/zunukulovilumoxulek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403143/normal_605629323cfca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463005/normal_5fefcd6ad301b.pdfIn PDF document text
    • https://bumipavadawafez.weebly.com/uploads/1/3/2/7/132710759/3c07005c.pdfIn PDF document text
    • https://volorizog.weebly.com/uploads/1/3/1/0/131070051/58eb3f9d28874a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413454/normal_601146e2f0e99.pdfIn PDF document text
    • https://nowitijot.weebly.com/uploads/1/3/4/7/134716658/kuwimorusurofuzesana.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375350/normal_60558a7da5ed7.pdfIn PDF document text
    • https://xevulesej.weebly.com/uploads/1/3/0/8/130874496/razelekovevera.pdfIn PDF document text
    • https://xebebobun.weebly.com/uploads/1/3/5/3/135350586/zosofuwufaxu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c07a2866-3565-421a-935c-ff593a10a0ef/jojaxoreda.pdfIn PDF document text
    • http://gabumur.pbworks.com/w/file/fetch/144486048/frases_para_boletas_2021.pdfIn PDF document text
    • http://barumena.pbworks.com/w/file/fetch/144449376/financial_markets_and_institutions_5th_edition_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/756fc463-9234-4261-b98e-b860ed9f089b/cast_of_the_movie_the_missing_with_tommy_lee_jones.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a720d228-f0ab-4260-bfc5-4c4231b38482/a_monster_in_paris_music_download.pdfIn PDF document text
    • http://pazimonofe.pbworks.com/f/ghatna_chakra_books_free_download.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_off0000db51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB51 5448 bytes
SHA-256: b45516b0d3a22e7bcef81e40ae6e8864adb183d9293e5effbb277885f4ce9ca1
font_01_sfnt_off0000edd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD9 10636 bytes
SHA-256: bd366097d1bbe1eeedd85de1d7da22a71da27a8108c02263b4dc10d00405889d