Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2581c1a4a6fb76f…

MALICIOUS

PDF

77.5 KB Created: 2021-06-08 21:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b529f82a26e7a5d8e9252a05103f173e SHA-1: aa1e274c065325edcda2c8b354a36bb4eb6237e3 SHA-256: d2581c1a4a6fb76f95b85dcfe6ab3c4b002cc96dbf7f0bfb1af7fcd29b4e7b4f
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It contains a significant number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme designed to lead users to malicious content. The document body, though heavily obfuscated, contains keywords related to a 'biology book' and 'pdf', aligning with the lure described by the heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://archism.ru/pbw?utm_term=dr+ali+biology+book+for+neet+2020+pdf PDF link annotation
    • https://karujelibofab.weebly.com/uploads/1/3/1/4/131406149/88f3ad80aedaddc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414174/normal_5ffb2363e7fdb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477164/normal_5ffc73d49d4c6.pdfIn PDF document text
    • https://waluxine.weebly.com/uploads/1/3/4/7/134759732/fevaruzaxibaru_vatojunaravex_jatuzujo.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4370307/normal_60afe471b60b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424013/normal_602488e8aa317.pdfIn PDF document text
    • https://fugomunufu.weebly.com/uploads/1/3/4/5/134586131/munolu-busadozukazade.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380411/normal_60146fa764e69.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4451561/normal_60b525a2e5b70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451227/normal_605d924ecbb7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446399/normal_600eeb7e6bf7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462696/normal_60bda81b834f5.pdfIn PDF document text
    • https://fufuwotasivixi.weebly.com/uploads/1/3/5/9/135966690/tasifugejubo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385631/normal_5fcea87349fdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386074/normal_6045c25a0ab2f.pdfIn PDF document text
    • https://generixa.weebly.com/uploads/1/3/5/3/135350481/sixirinozo_sowix.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/19e822be-c382-4d5b-b02c-f844ea62675a/blue_belt_recorder_karate_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8586a413-8818-43e5-a926-aeda0a1d9e4b/boy_scout_first_aid_merit_badge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c31b5afd-d09b-49b5-ae4c-0f1c832eae19/the_chronicles_of_narnia_the_lion_the_witch_and_the_wardrobe_book_series.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0daea59e-6a5d-49ae-8c88-498ac81200d9/pl_sql_execute_select_statement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/326f5675-21f5-4164-9cc7-2597024daf81/15400395664.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b651461c-10d0-42cf-b9ae-63fb5505f571/self-reliance_meaning_in_malayalam.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B5 5612 bytes
SHA-256: b470bee9c2f761d72d29cc993af16f342a78c01cb9eb399f68ad07f19174cf4f
font_01_sfnt_off0000f5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E8 2116 bytes
SHA-256: 991f7ef292b59849fa1804c361c52a6255426db797fbcab3b5d31d1f34ee76c9
font_02_sfnt_off0000ff93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF93 12276 bytes
SHA-256: 4b3751e3070576e13ead1579cf34b1f87fc4c64498565d7c816dabb154b46da4

Open this report in the interactive analyzer, or submit your own file for analysis.