Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb4ef8cd4afb5436…

MALICIOUS

PDF

74.5 KB Created: 2021-03-24 05:53:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 7f38009fffbdaf7b9616515d43a292a9 SHA-1: 21a1cadcb808a8dfe359855df08681a28f3e35a5 SHA-256: bb4ef8cd4afb5436fe9fa8b5b10bd0d7c34c58389c7e26c68c03dc08016e8926
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable domains, indicating a link farm or SEO poisoning tactic. The primary URL, 'https://fokemale.ru/award?keyword=arrl+handbook+pdf', suggests a lure to download a fake handbook. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/award?keyword=arrl+handbook+pdf PDF link annotation
    • http://safilow.iblogger.org/cc_mu_powerpoint_p_mien_phi.pdfIn PDF document text
    • https://cdn.sqhk.co/daborofus/xuhfja4/ps4_emulator_zip_file_download_for_android.pdfIn PDF document text
    • http://goldenframecollision.com/63928222262ianiq.pdfIn PDF document text
    • http://fixmarker.fun/how_to_deep_clean_a_porcelain_tub21lwk.pdfIn PDF document text
    • https://cdn.sqhk.co/natefisaka/dgi7gjl/rubber_chicken_toy_canada.pdfIn PDF document text
    • http://help-feedback-amzn8.xyz/kuvifopifezuxr3.pdfIn PDF document text
    • https://cdn.sqhk.co/ribegibonot/eOhbia8/8690552531.pdfIn PDF document text
    • https://cdn.sqhk.co/gituxogud/hic6Pgf/wixozo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a540aa65-2eb1-4ac3-86d0-bf6a54daac96.filesusr.com/ugd/2d797c_0727409e01f7449a915b9339ee8b3829.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/victoria_aveyard_red_queen_series_review.pdfIn PDF document text
    • http://kuxogazixup.rf.gd/19233496093.pdfIn PDF document text
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_85aaa2711eb74d03b11f4efb7304c23a.pdf?index=trueIn PDF document text
    • https://a7da3e60-63c8-46c1-a846-eab7df628ed2.filesusr.com/ugd/bba345_e4b609d373b34e8588daf4713bb574e9.pdf?index=trueIn PDF document text
    • https://3ae4d138-4ba3-4962-98fb-1b98b40a6a82.filesusr.com/ugd/38062a_580b57cfdfcd48bd9a0215735cd8eb2b.pdf?index=trueIn PDF document text
    • https://113c517c-d7b0-4b36-99d7-6722bcb7ef36.filesusr.com/ugd/8e66a5_7830876d3fa34ba081e89b8574c2e1d8.pdf?index=trueIn PDF document text
    • https://8488b7ac-84bc-45ae-88ed-26841205fc59.filesusr.com/ugd/7cda3c_e278e99f7f934fce858a6271a79add94.pdf?index=trueIn PDF document text
    • https://170a7d3c-74f0-42f5-9ead-98ae292a4922.filesusr.com/ugd/a18aa6_0265e6f9d49542d3bb7483f6b17a1964.pdf?index=trueIn PDF document text
    • https://ebbb41b5-b8b7-4bfc-9e1b-23e79ad93844.filesusr.com/ugd/5eba67_47fb028838c7406491a4486ffe7ef77f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xomepixo/html_css_js_templates_free.pdfIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/69243228748.pdfIn PDF document text
    • https://69a21580-3c80-4f81-8097-1ec0bc18215d.filesusr.com/ugd/bd7df1_bbda8eeb643e4fed9a39ddd5d480d704.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12A 5144 bytes
SHA-256: 6ac329284bd5088a29283eea18e6c3648e0fdbe2b332af6670e839414ffb25cd
font_01_sfnt_off0000f29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29B 12572 bytes
SHA-256: d9cdf88f1423504a310f4017c966a87ca6f50c4c2f0b5eb1980bbdf641f29e4f