Malicious PDF — malware analysis report

Static analysis result for SHA-256 87195f34b63d2f53…

MALICIOUS

PDF

77.1 KB Created: 2021-02-27 14:43:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: db3b20ec9efa849c27676a2c8f737c79 SHA-1: af2b90def635a884d174a86d0360b30526eb1d00 SHA-256: 87195f34b63d2f5361d5aa61cb4d843d74874de76560f9a303d5304bcf784c70
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, with one prominent URL pointing to a domain that appears to be a link farm, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata related to its creation, but no direct user-facing text that would indicate a specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://xezojetit.ru/award?keyword=schwinn+airdyne+ad4+upright+exercise+bike PDF link annotation
    • https://cdn.sqhk.co/fiporalisu/ajaU7hj/mac_dual_monitor_different_wallpaper.pdfIn PDF document text
    • http://dudipoviju.22web.org/gawibulijorovubanopib.pdfIn PDF document text
    • https://cdn.sqhk.co/niserutom/ckhhidH/bloomsburg_fair_map_2018.pdfIn PDF document text
    • http://zunowugijose.22web.org/how_long_do_renova_zero_pods_last.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380393/normal_5ff0ae11bb51b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447487/normal_5fcc22ba4aa2b.pdfIn PDF document text
    • https://cdn.sqhk.co/jasurisunav/smjcNNN/switch_using_scanner_in_java.pdfIn PDF document text
    • https://cdn.sqhk.co/xavipinav/diatjil/69495302702.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414173/normal_5ffe2fd67eb48.pdfIn PDF document text
    • http://bamefidev.mygamesonline.org/how_do_i_know_if_my_cpap_humidifier_is_working.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wiwabapanap.epizy.com/tamil_bible_free_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/19046675249.pdfIn PDF document text
    • http://kufalogomisag.epizy.com/divovujavupivo.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/najil.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/kira_yoshikage_theme_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/ably_noun_form.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_off0000ef6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6D 5960 bytes
SHA-256: 1d144b1514aaca20820ce6a7169249944bd48ce2dea285a86497de5018a058b6
font_01_sfnt_off000103cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CF 10412 bytes
SHA-256: 730c54a3c65e291bab0817620b1cdaa4fccb6469baa45877b5c46de6e4b17426

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