Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d022bc4e32ec5a4…

MALICIOUS

PDF

79.6 KB Created: 2021-03-02 13:34:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c60b3c75c0bc677416288086db800239 SHA-1: 2fbb7a0369463bdbc72333d71233a5e373568353 SHA-256: 7d022bc4e32ec5a42aa0affed86682ce831566b2643889bc70c4bd8a0cf0b6be
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a phishing or malware distribution attempt, likely leveraging embedded JavaScript for redirection or exploitation.

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://soxebez.ru/123?utm_term=warrior+diet+intermittent+fasting+results
    • https://cdn.sqhk.co/bewewojiwo/jNXyjiy/33353375278.pdf
    • https://xajufaxisadu.weebly.com/uploads/1/3/4/5/134585978/203a2.pdf
    • https://cdn.sqhk.co/wazikunal/jaggghH/wecom_inc_nj.pdf
    • https://cdn.sqhk.co/silakozafi/bieibgh/vitezejitoliru.pdf
    • http://urott-hu.com/tabajvkhk3.pdf
    • http://milano-moda.space/8162316610qjo76.pdf
    • http://fitokapss.xyz/6th_grade_first_day_of_school_worksheetsoch4u.pdf
    • http://skidki-day.shop/gentle_alarm_clock_app_iphonet7mbf.pdf
    • http://upsbox.ru/62585550872224xq.pdf
    • https://cdn.sqhk.co/zokosofu/Nr2ja0o/to_the_moon_netflix_rotten_tomatoes.pdf
    • http://detonicinitalia.website/ana_de_las_tejas_verdes_onlineazvvz.pdf
    • https://sezariserafuf.weebly.com/uploads/1/3/4/6/134673330/4cd26b6e4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/libosokune/science_process_skills_worksheets_printable.pdf
    • https://s3.amazonaws.com/muvojugejoxip/21090833185.pdf
    • https://s3.amazonaws.com/wefemabeni/bomum.pdf
    • https://s3.amazonaws.com/zuses/representative_payee_form_example.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_off0000fb27.bin
1d6ba69d6e020f3a587b6b0f3222cf4f8c233e0be10b63e6a3507301d8d11b42
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB27 5240 bytes
font_01_sfnt_off00010cf1.bin
8ebbf90bc6cf42afc2931d0e6a0ec346ea668a6d9736932b83cafe216b2d3e74
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF1 10780 bytes