Malicious PDF — malware analysis report

Static analysis result for SHA-256 988b8784da50a605…

MALICIOUS

PDF

79.3 KB Created: 2021-02-25 21:13:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 79b0fb361b05f7b64bc4a0d44aa70467 SHA-1: d97e8bdd7f662effde2364b9c707900f15f79e5d SHA-256: 988b8784da50a60580dfc62d9e41d54c429c26f04ff44150778ec63992cef3b5
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://jottigo.ru/award?keyword=sodastream+gas+refill+cylinder+60l PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4483071/normal_6015b643a415d.pdfIn PDF document text
    • https://velumosatowe.weebly.com/uploads/1/3/4/8/134883763/wajoboluxixeje.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473618/normal_5fddc021a7fe7.pdfIn PDF document text
    • https://damatabawapu.weebly.com/uploads/1/3/1/3/131379320/vosivedad-jotojozutakuzav-lasuvu.pdfIn PDF document text
    • http://laitlabs.pro/dotalijufewojurkb3hp.pdfIn PDF document text
    • https://laximazerafa.weebly.com/uploads/1/3/4/2/134235816/dilunate.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502178/normal_5fd09bcb76895.pdfIn PDF document text
    • https://minesipapotevu.weebly.com/uploads/1/3/4/1/134108733/384852.pdfIn PDF document text
    • http://flowerport.shop/oublier_un_sort_dofus15s1f.pdfIn PDF document text
    • http://puwonasomoso.22web.org/89752343111.pdfIn PDF document text
    • http://itagreen.fun/53528889117hayri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443292/normal_600f9906be53d.pdfIn PDF document text
    • http://giveaway2020.info/gidiginudifb0xpa.pdfIn PDF document text
    • http://tcerkovniekupola.space/228446934762n8pw.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://kemivitakes.rf.gd/bojimilufedobem.pdfIn PDF document text
    • http://lenepozomewu.epizy.com/gozugalivugifejunuwiwu.pdfIn PDF document text
    • http://difesasud.epizy.com/ffxv_comrades_materials_guide.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_off0000e915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE915 5632 bytes
SHA-256: 0a0e5311d1e45298901695f3606a51e362839649bde58b1db9f72f1675bd15c2
font_01_sfnt_off0000fc28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC28 10984 bytes
SHA-256: 18765ef9b349f441e1ed400b6b77cd2111cc2606883933c53a8894d8abac99ca
font_02_sfnt_off000121c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C0 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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