Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc56e8c12bec3c17…

MALICIOUS

PDF

77.8 KB Created: 2021-03-20 21:53:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1a7f8801f62c85f6487f45cbc7e3968 SHA-1: d0fd2e8d7a4b51ea7b59c076b35b540ffbfed769 SHA-256: bc56e8c12bec3c177ec47482f10b7cdb0ba35737a0d82c6feb9fa4f25e19edf8
156 Risk Score

Malware Insights

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

The PDF file contains a mass of external links, identified as a link farm, with one prominent URL leading to a suspicious domain. ClamAV and ML classifiers strongly indicate maliciousness, specifically flagging it as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to 'public relations agent education needed', likely to direct users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/aws?utm_term=public+relations+agent+education+needed
    • https://kivobuduzuv.weebly.com/uploads/1/3/0/7/130739084/zidarekotusar-wosavoja-jusoxowabilet.pdf
    • https://najatiruz.weebly.com/uploads/1/3/0/7/130738831/5091383.pdf
    • https://zififawatef.weebly.com/uploads/1/3/4/3/134384507/rimirafagorege-zumapezedane-mudelusetig-pevokezurij.pdf
    • https://vawilateg.weebly.com/uploads/1/3/4/6/134697686/xosodulomitez-lenubuwutijizi-jumimu-lokufotoxezakar.pdf
    • http://desekikimok.22web.org/rukiwukurifuweza.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ae556b94-1422-4e54-bd19-e385abbbb333/40115365618.pdf
    • https://s3.amazonaws.com/galinikagopit/pinebopikomi.pdf
    • http://fulovobalume.rf.gd/76381116001.pdf
    • https://s3.amazonaws.com/kobivimelelo/real_estate_flyer_template_indesign.pdf
    • https://uploads.strikinglycdn.com/files/98c342b1-028a-43bd-9789-508b6ea04e50/fefasoninulevesudonaxutax.pdf
    • https://s3.amazonaws.com/bezorito/anisette_std_bold_font_free.pdf
    • https://uploads.strikinglycdn.com/files/62b1883f-279d-4724-b04c-69e63abaec12/why_is_my_electric_fan_oven_not_working.pdf
    • https://uploads.strikinglycdn.com/files/96212f08-dc4c-4cf8-9bcc-449b7242440e/duwaz.pdf
    • https://s3.amazonaws.com/sazixipame/4102585239.pdf
    • https://s3.amazonaws.com/neviwove/43428302977.pdf
    • https://s3.amazonaws.com/kefefetafij/81290152709.pdf
    • https://s3.amazonaws.com/semuxemakaw/sozadejisejo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1cb.bin
bd35df6038099831ecc41d2cf0ffb89fc49e62d8e8f3123369a67fd9953e1e8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CB 5248 bytes
font_01_sfnt_off000103a7.bin
0df61c966ee2d1b03530e750e91255667aef7a7f7c724acd03fc4cfd638e109d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103A7 11216 bytes

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