Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d2e4b1292bf52ad…

MALICIOUS

PDF

77.1 KB Created: 2021-05-30 15:51:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d06e4d4b5be499377fecd0dc47035475 SHA-1: bb1dae0f5cec58891f8d2b241bd90f4734a404da SHA-256: 1d2e4b1292bf52ad2ba5e15df2762ae4ff0473d299f7225f000f2db62626382a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to direct users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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 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://xajibur.ru/strik?utm_term=monthly+income+expense+report+template
    • https://static.s123-cdn-static-d.com/uploads/4418777/normal_60b02e24b5810.pdf
    • https://fajuvupo.weebly.com/uploads/1/3/5/3/135310445/ribenikexo-gomonezopupopor-wigosago-waxuf.pdf
    • https://xovesoxak.weebly.com/uploads/1/3/0/8/130813458/8500569.pdf
    • https://tekipagitew.weebly.com/uploads/1/3/4/8/134871071/kunupufasixugis_mujogowanegakik_pifalojipul_zeguxu.pdf
    • https://static.s123-cdn-static.com/uploads/4413223/normal_5ff8d3ce4350e.pdf
    • https://static.s123-cdn-static.com/uploads/4405644/normal_5ff5736f8c5bf.pdf
    • https://static.s123-cdn-static.com/uploads/4382629/normal_600636532f030.pdf
    • https://tedajurilazunu.weebly.com/uploads/1/3/0/7/130739962/3258889.pdf
    • https://wujiwugamibi.weebly.com/uploads/1/3/1/3/131398142/fedila.pdf
    • https://static.s123-cdn-static.com/uploads/4480412/normal_5fe0dccfce0f5.pdf
    • https://nufivinob.weebly.com/uploads/1/3/4/6/134682897/63f94d954be1b0.pdf
    • https://lagipusavopafi.weebly.com/uploads/1/3/7/5/137509438/jabiwoxezosum.pdf
    • https://tulosiwawi.weebly.com/uploads/1/3/5/3/135326734/keruzeguruvijaniwo.pdf
    • https://sojabejob.weebly.com/uploads/1/3/4/8/134890412/e0b97e02baeab.pdf
    • https://fozunisomizu.weebly.com/uploads/1/3/4/6/134666093/fulutadem_vamuxobabudure_jiranopozaxona_jutab.pdf
    • https://cdn-cms.f-static.net/uploads/4382189/normal_5fd0eabeee1f4.pdf
    • https://wajifisawebe.weebly.com/uploads/1/3/4/4/134480175/ratexoriwerajo-zesel.pdf
    • https://vizexetu.weebly.com/uploads/1/3/4/8/134864552/tiwibarenuxile-sugujirabuza.pdf
    • https://cdn-cms.f-static.net/uploads/4464078/normal_602df9028f3db.pdf
    • https://fubaxuzepavuzoz.weebly.com/uploads/1/3/4/7/134755559/malelejadojo.pdf
    • https://wugepazi.weebly.com/uploads/1/3/4/3/134348030/vutulilekejokidi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/90a306a4-2d97-4c42-98e0-0e4e41834e85/percy_jackson_the_titans_curse_reading_level.pdf
    • https://uploads.strikinglycdn.com/files/af44f49e-49e0-43ac-bac5-97ee98138487/asme_section_ix_2019.pdf
    • https://uploads.strikinglycdn.com/files/b1afc489-9c4c-4037-9baf-ff089e34f6e9/where_to_buy_jason_vitamin_e_cream.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0b7.bin
e6af4acc34bdf84c5f7463b7cbd29ad654774275de740ac9036b50ed56eb95c5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B7 5348 bytes
font_01_sfnt_off000102d2.bin
f586997fbc08d6e92c2cd80d6cbe89f34d37cb06936ff2d191a6a169733fd468
pdf-font-stream PDF embedded font (sfnt) at offset 0x102D2 10464 bytes