Malicious PDF — malware analysis report

Static analysis result for SHA-256 88077d8669ea6d04…

MALICIOUS

PDF

85.0 KB Created: 2021-03-15 01:55:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 039faa7afcc4ffbc254ec79dd68aaa40 SHA-1: 603237a8efcdaa858db9a7b4a614ff604d28269d SHA-256: 88077d8669ea6d0483689dd6e889933195b76d77f5c673db5f318319ac285c0b
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 redirect users. The primary URL and associated links indicate a phishing attempt related to downloading an APK, likely malicious. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/wix?keyword=megabox+download+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415962/normal_604dad694175c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451561/normal_604d6c701a870.pdfIn PDF document text
    • https://gokefezenomi.weebly.com/uploads/1/3/4/0/134040807/5cdeac7.pdfIn PDF document text
    • http://it50disconto.info/principles_of_psychology_breedloveuxbe5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416332/normal_5fe21ae87a601.pdfIn PDF document text
    • https://nipetetoxijekuj.weebly.com/uploads/1/3/4/7/134718304/4172528.pdfIn PDF document text
    • http://pefiworawodud.mypressonline.com/gmat_book_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403539/normal_6046a7e66ffd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471109/normal_6043ebcc00339.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375698/normal_5ff26807f2e43.pdfIn PDF document text
    • http://bhd-management.space/weekly_planner_free2o5z7.pdfIn PDF document text
    • http://tijudozi.scienceontheweb.net/what_is_audacity_definition.pdfIn PDF document text
    • http://ligugiban.scienceontheweb.net/the_dragonet_prophecy_graphic_novel.pdfIn PDF document text
    • http://raxejudesezix.scienceontheweb.net/35082502503.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://kufekisawisewo.onlinewebshop.net/41041356203.pdfIn PDF document text
    • https://b23183eb-b2e5-455e-bc25-91fac1efd10f.filesusr.com/ugd/cc14e4_f6409ca630594b6e967bd7e3b9915096.pdf?index=trueIn PDF document text
    • https://19a39513-20cc-49d1-a75c-e30ce0314142.filesusr.com/ugd/f99735_5ef884fa562f4e7bbfff457eb8589538.pdf?index=trueIn PDF document text
    • https://12c21f6a-324e-488c-af83-7e1076049286.filesusr.com/ugd/e84f25_b6208b3325314649b5d789f77108e972.pdf?index=trueIn 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_off0000f9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A8 4880 bytes
SHA-256: f931d767dd6e14c9358e693969b5e352c461a74bf5a4e08b3715e288a631b611
font_01_sfnt_off00010a62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A62 14724 bytes
SHA-256: ca055c0a89e0762ab8c8ac13199f5d5873a0a056c6fffc50e870b952c89698e6
font_02_sfnt_off00013866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13866 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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