Malicious PDF — malware analysis report

Static analysis result for SHA-256 906f1245d195cedd…

MALICIOUS

PDF

106.6 KB Created: 2021-03-02 02:19:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 7581b1cd556966764d74d6061d42db73 SHA-1: 2bad36849c4c4b5c769095d61a0a035d2c3def43 SHA-256: 906f1245d195cedd27af4c7fe62fa810eab60e0164606bd8d6668f365c9e4c1b
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a significant number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern. No scripts were extracted, but the overall structure points to a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • 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://resalured.ru/wix?keyword=linear+phased+array PDF link annotation
    • http://bilkaita.space/112322457711h186.pdfIn PDF document text
    • https://duxoberadu.weebly.com/uploads/1/3/4/7/134718286/veluvirusowinoxekaw.pdfIn PDF document text
    • http://albl.ru/fearless_friday_4a_football_scoresy4xjm.pdfIn PDF document text
    • https://cdn.sqhk.co/pepegizeso/gsgiQgc/lukaket.pdfIn PDF document text
    • https://cdn.sqhk.co/noloxunipe/cOggijc/star_wars_battlefront_heroes_tier_list.pdfIn PDF document text
    • http://prizinsta24.online/rurigotiduna0c4r4.pdfIn PDF document text
    • http://7gusevshop.space/lekejutesitorol9njbf.pdfIn PDF document text
    • https://cdn.sqhk.co/gutinisiv/ajfCjbt/john_van_ness_obituary.pdfIn PDF document text
    • https://cdn.sqhk.co/wosepimi/ggcgjjh/jiffy_lube_coupons_monterey_california.pdfIn PDF document text
    • https://venunuwaxel.weebly.com/uploads/1/3/2/7/132740799/dafovifarolizun.pdfIn PDF document text
    • https://cdn.sqhk.co/diruzatojep/pZifTCt/38402010945.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/bubeto/xowisadazuf.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/angular_format_number_2_digits.pdfIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/barupaxoziralis.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000137e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137E1 4656 bytes
SHA-256: 0d246ec9735a77d118e044f98e46f2d29cd2fa73a4c27477306d5484fba0cb37
font_01_sfnt_off00014796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14796 15668 bytes
SHA-256: 7a750cf045e35f12f8f94aa5f27cc9da8c61e4aa09650eac1fd74aecfb71ec74
font_02_sfnt_off000179e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179E4 16152 bytes
SHA-256: 107dd7461bad0ee7f69ec232d7edbfa51533cbe03462e0930b0bd999c9024e27
font_03_sfnt_off00018eea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EEA 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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