Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a865a73fd7a82d0…

MALICIOUS

PDF

68.4 KB Created: 2021-04-02 19:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e30b07f006fc9d88135cc6b55c4dd618 SHA-1: 17c7d4356de7a98be3931b424a081fe4c4a8fe85 SHA-256: 4a865a73fd7a82d06fbea948effbbb3d46fcb8cc25533b83b077dd1017bbc446
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, many pointing to other PDF files, suggesting a link farm or a method to distribute further malicious content. The document body, though heavily obfuscated, contains text related to an encyclopedia, likely a lure.

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://golowaki.ru/123?utm_term=the+new+children%2527+s+encyclopedia+pdf+free
    • https://xugibadibexupov.weebly.com/uploads/1/3/4/6/134684970/b2107f7bbff8f86.pdf
    • http://nelodagavezes.mygamesonline.org/simple_sql_queries.pdf
    • https://mivetemadika.weebly.com/uploads/1/3/4/4/134471856/ditavojawiwab.pdf
    • https://nuridofif.weebly.com/uploads/1/3/4/2/134234753/pivizi.pdf
    • http://rijunoje.mygamesonline.org/duzagofarulewuxek.pdf
    • https://suridivulav.weebly.com/uploads/1/3/5/3/135312357/xekujupigemizo.pdf
    • http://counterman.ru/what_helps_public_speaking_anxietywaqhu.pdf
    • http://katipef.medianewsonline.com/what_is_the_capacity_of_kenmore_90_series_washer.pdf
    • http://gisujug.mypressonline.com/80670516259.pdf
    • http://raisinslabs.club/honda_shadow_1100_exhaust_pipes9jyai.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wonumafubij/74410485640.pdf
    • https://s3.amazonaws.com/dowavelaxam/95721176396.pdf
    • https://s3.amazonaws.com/pevuwarobuvowa/reflexive_symmetric_and_transitive_relations.pdf
    • https://s3.amazonaws.com/fowonaxul/fastbond_10_technical_data_sheet.pdf
    • https://s3.amazonaws.com/jemisajoda/86545829889.pdf
    • https://s3.amazonaws.com/memexelu/55467313633.pdf
    • https://s3.amazonaws.com/suxugipipolazog/5763977329.pdf
    • https://s3.amazonaws.com/bikikanafopavu/xakaruboxewaxanujiv.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_off0000cb10.bin
b46486f08082d5e003429bbbede98e36673b5c1af14dc099558a25a9cdac2fb0
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB10 5420 bytes
font_01_sfnt_off0000dd97.bin
6d919cabafb3b4c3b9b1283db332c83e8a4243ea0fb0e28c2d4c557d57587f0c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD97 10888 bytes