Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba2544a439abaf44…

MALICIOUS

PDF

76.9 KB Created: 2021-01-18 02:26:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 2ef0cdcc75ba7e1d3b1bf558226294e0 SHA-1: 804c9c47236ad6fd54ce50e1f8507aadcf097f7f SHA-256: ba2544a439abaf44623687f2998c62559d4060e00dbb1e8288e050307a11fb1a
184 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to 'weight watchers points book download pdf'. The presence of multiple links hosted on disposable domains and the ML classifier's high confidence score indicate a phishing or redirection campaign. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/123?utm_term=weight+watchers+points+book+download+pdf In PDF document text
    • https://zoxutelipiroga.weebly.com/uploads/1/3/1/8/131871488/7017620.pdfIn PDF document text
    • https://dadoxagowona.weebly.com/uploads/1/3/4/6/134677816/40363fcb323e699.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500186/normal_5fcd94ac881e9.pdfIn PDF document text
    • https://cdn.sqhk.co/zaperarori/egd20he/wegizuxifekedakekefi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391317/normal_5fe253d58dee3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506200/normal_5fd103e371ed5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375531/normal_5f8ef865dd6d2.pdfIn PDF document text
    • http://fesupopimos.66ghz.com/59826013433.pdfIn PDF document text
    • http://leduxebawini.22web.org/20439854858.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://joriboka.epizy.com/rotijikukezosif.pdfIn PDF document text
    • http://giwofigu.epizy.com/king_bed_flannelette_sheet_sets.pdfIn PDF document text
    • http://najaxobefirag.epizy.com/nolizomoneloxifidedebil.pdfIn PDF document text
    • http://sejojoxo.epizy.com/42868965886.pdfIn PDF document text
    • http://sarozaxag.epizy.com/67423867904.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_off0000e023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE023 5512 bytes
SHA-256: 58f085fe272be6662c09a64731bfbca9c1d92ba1be1c9c8a0634c9fff17ba80f
font_01_sfnt_off0000f2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EA 10856 bytes
SHA-256: 973bffdb228e2a8a1796f95b6a4ddbc378900c02d1decaaf17b6fc74c2ebc2e9
font_02_sfnt_off0001180d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180D 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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