Malicious PDF — malware analysis report

Static analysis result for SHA-256 03337ff766e449b8…

MALICIOUS

PDF

72.4 KB Created: 2021-02-16 04:15:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: cc1f628c43e82c39e5768b39c5851f24 SHA-1: 929077d521fe7f77ebe1a91218b98d4b265260a8 SHA-256: 03337ff766e449b8a652fd3dd9f53e50a05558bdc85816ca96a1a7b5c85578ec
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains and hosted on services like weebly.com and cdn.sqhk.co, indicating a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and external links are indicative of techniques used to redirect users to malicious sites.

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://jacksth.ru/123?utm_term=fujitsu+scansnap+ix500+setup PDF link annotation
    • https://cdn.sqhk.co/gafisasiwu/igZgiUp/paramajaliga.pdfIn PDF document text
    • http://zavodtriumf.com/south_west_gauteng_college_application_form_2020hq45b.pdfIn PDF document text
    • https://bakubirusi.weebly.com/uploads/1/3/4/6/134680497/zalaxozufipumasikemi.pdfIn PDF document text
    • https://meluwirukumipi.weebly.com/uploads/1/3/1/4/131483006/nomodofunike.pdfIn PDF document text
    • https://cdn.sqhk.co/pegipoveridi/iaCGwVK/tumuxejufewifizowazuxerej.pdfIn PDF document text
    • http://indohealth365.online/systematic_sampling_questions_and_answers2bh9z.pdfIn PDF document text
    • https://cdn.sqhk.co/vefusujix/zy28shh/cd_queen_greatest_hits_1_e_2.pdfIn PDF document text
    • https://cdn.sqhk.co/murafabu/jfzifjj/nogekitorokorumadubep.pdfIn PDF document text
    • https://cdn.sqhk.co/pavujakorige/jhCgez2/vinidutuluzapukep.pdfIn PDF document text
    • https://ranezilipevag.weebly.com/uploads/1/3/5/3/135392607/bizilumowi_walixipewar_gosobotetatipu_kinagixa.pdfIn PDF document text
    • https://bejamipoxef.weebly.com/uploads/1/3/5/3/135318713/3740320.pdfIn PDF document text
    • https://jedadizonavo.weebly.com/uploads/1/3/4/7/134721040/9a44a8ace0.pdfIn PDF document text
    • http://lnstagaram-verifiedbadges-from.com/66913709618zf0nx.pdfIn PDF document text
    • https://luwujejajevobo.weebly.com/uploads/1/3/1/4/131407494/josoboga.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
    • https://s3.amazonaws.com/gofilafixu/xoxirori.pdfIn PDF document text
    • https://s3.amazonaws.com/golepe/klb_chemistry_book_3_teachers_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/85352236583.pdfIn PDF document text
    • https://s3.amazonaws.com/xaliwalufoguni/roxorukapumosudiz.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_off0000d0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DA 4936 bytes
SHA-256: 987c152aa2da0d939f6eff0cba01d9d41d3a24738a75db4c07f6b17f3c353c39
font_01_sfnt_off0000e1b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B9 10828 bytes
SHA-256: 28927e39b1599c3d7922f5e39b056f94711cf4af99a39ad72e0c594a142a0a1e
font_02_sfnt_off0001068b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068B 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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