Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab2cc810bda757aa…

MALICIOUS

PDF

82.2 KB Created: 2021-04-06 11:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 9071121749322eaf89d05b49df1bb521 SHA-1: 58fc61878dc24964befe0b87a0841b1ec76602d6 SHA-256: ab2cc810bda757aa6542ae093c3991d900a014f99d6c20263d265d9244cbee45
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, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The embedded URLs point to suspicious domains, and the document body, though heavily obfuscated, contains keywords related to 'book pdf' which could be used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://soxebez.ru/award?keyword=how+to+speak+english+fluently+book+pdf PDF link annotation
    • https://fusufuxono.weebly.com/uploads/1/3/1/6/131606103/zataweleralob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365598/normal_60412d3cc3702.pdfIn PDF document text
    • https://jotogenawe.weebly.com/uploads/1/3/1/4/131406354/8016377.pdfIn PDF document text
    • https://meloxatug.weebly.com/uploads/1/3/0/9/130969811/petinafeguxunupodum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460055/normal_600a6582bd81c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482636/normal_5fca7093bd789.pdfIn PDF document text
    • https://tigasedoxopafu.weebly.com/uploads/1/3/4/7/134707490/jemerekux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487007/normal_60507dabe5ad2.pdfIn PDF document text
    • https://demepitogiwod.weebly.com/uploads/1/3/4/0/134097880/bevaz.pdfIn PDF document text
    • https://nazokorebuvawir.weebly.com/uploads/1/3/0/7/130776058/7149232.pdfIn PDF document text
    • https://totuseki.weebly.com/uploads/1/3/5/3/135322554/wuduzurom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403816/normal_6035c7746e998.pdfIn PDF document text
    • https://palotuzumi.weebly.com/uploads/1/3/5/9/135991270/8801459.pdfIn PDF document text
    • https://nagajaburelu.weebly.com/uploads/1/3/2/7/132740350/4516381.pdfIn PDF document text
    • https://zinorenote.weebly.com/uploads/1/3/5/3/135349773/37d3e52f.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/56ee85b5-f464-4627-ae97-a4bf3483d1f0/how_to_connect_logitech_z313_speakers_to_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94876126-7095-4e74-abdb-ed9632bacd81/to_kill_a_mockingbird_chapter_9-11_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1cab8f2-8eec-4a1e-adae-b7c9ac15b95a/graph_theory_mathematical_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2a6ab62-2ab5-42c1-900b-a9b533bed4b4/how_to_rap_better_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1f083ec-6382-4138-b338-cadf081798f6/introduction_to_c_language_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b18d447-e469-48cc-9dcb-e61f3ae2bc24/41103574603.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb57547f-600b-4a7d-95bd-17bdaa3b0778/sexajofuwasexejoz.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e49b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49B 5568 bytes
SHA-256: 9705e18793c0de37e62f476002b89fcd36b75e436b0882da2862d37fa250c598
font_01_sfnt_off0000f79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79F 13812 bytes
SHA-256: 1a5658253c2a99fc35b754e5487695e7f440c6011aca8b14753d83dd85ed8b1f
font_02_sfnt_off0001238d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238D 16700 bytes
SHA-256: 92ca1dbe2fdbb23e0373d4639c171c2e3a3480f85b619f62965ee981f395c81f