Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a1c44d7c8eeb0cd…

MALICIOUS

PDF

81.0 KB Created: 2021-02-12 16:40:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 1dc8a79a5f5e1ad4ab716fc58355131b SHA-1: 9b6822b0f55ba049b1c238940b02a3edd7c288c3 SHA-256: 5a1c44d7c8eeb0cdeb18df9e4597c3a276cf8db24d66ff36abb56af9342fe73a
176 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-themed, suggesting a link farm or phishing attempt. The document body, though heavily garbled, contains a URL related to a 'sim card not provisioned' query, which is likely a lure. The presence of ClamAV detection and ML flagging further supports a malicious classification. No scripts were extracted, but the PDF structure and embedded URLs indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://leonvi.ru/123?utm_term=sim+card+not+provisioned+what+does+that+mean PDF link annotation
    • http://fruktovik.com/rscit_answer_key_30_september_2018etw9y.pdfIn PDF document text
    • https://zabagazepag.weebly.com/uploads/1/3/4/4/134498959/gibamedemenasi.pdfIn PDF document text
    • https://cdn.sqhk.co/sobupepokor/bJib6J4/vortex_gravity_bong_amazon.pdfIn PDF document text
    • http://skidki-day.store/63740226912ghx2l.pdfIn PDF document text
    • https://wamukefak.weebly.com/uploads/1/3/5/3/135324497/wajedivawemogesidak.pdfIn PDF document text
    • http://velesvoyage.ru/cat_simulator_kitty_craft_mod_apkwc9cw.pdfIn PDF document text
    • http://gutprod.xyz/examples_of_business_email_writing_in_englishgfbfd.pdfIn PDF document text
    • https://cdn.sqhk.co/suxujaba/rQijieP/ladowatujel.pdfIn PDF document text
    • https://dopotalufiru.weebly.com/uploads/1/3/4/6/134601398/wozukebetob.pdfIn PDF document text
    • https://gawakugoful.weebly.com/uploads/1/3/4/7/134757428/raxanupujexovu.pdfIn PDF document text
    • https://vukibipodut.weebly.com/uploads/1/3/4/6/134690361/1764256.pdfIn PDF document text
    • https://cdn.sqhk.co/tefozakozup/igi6ibQ/free_stuff_apps_for_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/xekiparot/Y7ihhdG/word_farm_crossword_cevaplar_135.pdfIn PDF document text
    • https://cdn.sqhk.co/nolagutotato/jfrAWji/stickers_for_whatsapp_arabic_funny.pdfIn PDF document text
    • https://cdn.sqhk.co/musamari/hhcejeg/entrepreneurship_skills_questionnaire.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/domegagowevag/47284913302.pdfIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/mexuwaxixuxogofugevusiw.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/kinson_primary_school_ofsted_report.pdfIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/fositusamexutov.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/birds_nest_formal_dresses.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_off0000fdb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB1 5536 bytes
SHA-256: 84be498dcad1fee90d96b72403350aaa49d291f92df888735afd6a3b43bf9e91
font_01_sfnt_off0001106d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106D 11076 bytes
SHA-256: a067417914ba16ba2e77bb2f965af8cf49b6053a30302c04360efe26bab9e8e4

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