Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8a911bfebd9c414…

MALICIOUS

PDF

78.3 KB Created: 2021-03-13 23:36:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: d7da83996459597326a06902447e94d6 SHA-1: aa2855844f58184c1c74b6099e4d7bfe05175e93 SHA-256: f8a911bfebd9c4142bffe043c8dcffd9c0d749ec7fe880a0c54342eb299c78eb
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a PDF link farm. It contains numerous external URIs, with a critical heuristic specifically flagging a mass of external PDF links. The document body is heavily obfuscated, but the presence of embedded URLs and the link farm heuristic strongly suggest the intent is to redirect users to malicious sites, likely for phishing or further malware delivery.

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 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.
  • 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://botokaw.ru/wix?keyword=topographic+map+reading+exercises PDF link annotation
    • https://cdn.sqhk.co/gosuzufus/jgjQo2V/2408803452.pdfIn PDF document text
    • https://cdn.sqhk.co/tujuvemevo/7pSggB4/25139889415.pdfIn PDF document text
    • http://copyrightsupport-ig.com/40971387189hn67u.pdfIn PDF document text
    • https://cdn.sqhk.co/vasinabew/saiggt8/vanesodupufuru.pdfIn PDF document text
    • https://buruwezixefekiw.weebly.com/uploads/1/3/0/7/130738548/vukoziwawefuveka.pdfIn PDF document text
    • https://cdn.sqhk.co/visesefider/bdGGu35/chat_rooms_for_depression_uk.pdfIn PDF document text
    • http://zuvels.xyz/husky_pressure_washer_1800_psi_home_depotsepyt.pdfIn PDF document text
    • https://zupuluduwiwafop.weebly.com/uploads/1/3/2/6/132681460/dategi.pdfIn PDF document text
    • https://cdn.sqhk.co/nidebuwe/rgiIRIb/spyro_2_ocean_speedway_orb.pdfIn PDF document text
    • https://cdn.sqhk.co/giwibilawa/hcjjnhb/93681780137.pdfIn PDF document text
    • https://cdn.sqhk.co/jalosemuv/hjeifhj/hobby_bird_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/nowonipewo/fgighdk/68783541720.pdfIn PDF document text
    • https://dimavuvinidet.weebly.com/uploads/1/3/1/3/131397938/5d8ba23e9.pdfIn PDF document text
    • https://cdn.sqhk.co/gimiraxu/ijjhieB/pedojexis.pdfIn PDF document text
    • https://cdn.sqhk.co/loxepafigav/jbgj5Hk/2694157407.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/dexodekelaseki/94480959131.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/android_10_pixel_3_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/13178141336.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE522 5180 bytes
SHA-256: b617bffa2f979e842fd5187e09fc91478f5f71c1733b9ed0bc53ff8bab298087
font_01_sfnt_off0000f68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68D 11152 bytes
SHA-256: edb369301f21ace29712071a18afac98166a90aceb3c831227e3136d3ea1381b
font_02_sfnt_off00011c6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6F 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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