Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fc3c00472fc1fb1…

MALICIOUS

PDF

87.6 KB Created: 2021-04-05 02:43:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f1920228528e1e4e37ec28af515b73db SHA-1: 55cdd0d3979fd8f19b7c0d6057a49dee79efffd1 SHA-256: 7fc3c00472fc1fb1d1facedfda642a036ba0d5ceb4ee6d6b80f9b9c4480c63a6
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://golowaki.ru/aws?utm_term=calligraphy+courses+near+me PDF link annotation
    • http://detonic-italy.website/565090175846kxm7.pdfIn PDF document text
    • https://vidiguwases.weebly.com/uploads/1/3/4/3/134347373/wubabujejufuvitofodi.pdfIn PDF document text
    • http://pazujiz.mygamesonline.org/70913228074.pdfIn PDF document text
    • https://dibozuvoba.weebly.com/uploads/1/3/4/6/134692955/tusepunemisur.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/h7hj3xk/divokesuxu.pdfIn PDF document text
    • https://jupolojujilozas.weebly.com/uploads/1/3/4/5/134598947/redipoxotasup_nixewarokosewi.pdfIn PDF document text
    • https://jibokogemi.weebly.com/uploads/1/3/4/7/134767321/4567072.pdfIn PDF document text
    • https://fajizaxaro.weebly.com/uploads/1/3/1/3/131381717/7310687.pdfIn PDF document text
    • https://cdn.sqhk.co/ranetixeba/a7Ficla/thai_alphabet_chart_app.pdfIn PDF document text
    • https://janodiwuzujemux.weebly.com/uploads/1/3/1/3/131382133/2d4f3d4e.pdfIn PDF document text
    • http://wuxetij.mypressonline.com/61529206500.pdfIn PDF document text
    • http://tefuvawilutir.mypressonline.com/conjunctive_adverbs_worksheets_with_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/dokukavifig/hSjfFnr/blacksmith_stoves_instructions.pdfIn PDF document text
    • http://hookup756.fun/monty_python_lumberjack_song_sheet_musicik08g.pdfIn PDF document text
    • http://helplnstagramcontact5087423.com/853843891908322u.pdfIn PDF document text
    • https://cdn.sqhk.co/vikafaselida/MdQWXjc/bird_box_cast_felix.pdfIn PDF document text
    • https://pesonukakevu.weebly.com/uploads/1/3/4/8/134863065/dcfe61a403a18c.pdfIn PDF document text
    • https://muxapikaw.weebly.com/uploads/1/3/5/3/135346573/migekafanizep.pdfIn PDF document text
    • https://danifiwap.weebly.com/uploads/1/3/4/5/134585556/velasolotodevuguto.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://karatufi.epizy.com/fusakorunob.pdfIn PDF document text
    • http://jezagap.epizy.com/sunireduxifoxidoda.pdfIn PDF document text
    • http://ninivekav.rf.gd/zazumosatetisap.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11653 5352 bytes
SHA-256: 966f049b4fc45fa641af1744ca75a1c7ef0d4f1537a2baf0a2384721978ce63a
font_01_sfnt_off00012867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12867 11896 bytes
SHA-256: b28a35daaf9f577f54d8a03d68903fb62159634c4ab997cd1e6434fc2edaf0af

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