Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8545c211b98c1f3…

MALICIOUS

PDF

72.5 KB Created: 2021-02-21 08:04:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 3cba19156e736b64398b21fb239ed2ca SHA-1: f69f9d24300632ca66e3fd45a94c2fc421ccaf0f SHA-256: a8545c211b98c1f3c52dcd96dfc92d2074536766b44708cf997f5dbbc30c521a
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or redirection tool.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://crophysi.ru/wix?keyword=windows+firewall+connection+sharing+not+allowed In PDF document text
    • https://kazofinuso.weebly.com/uploads/1/3/4/3/134369681/fcb1d8.pdfIn PDF document text
    • https://kopaluzakiletal.weebly.com/uploads/1/3/0/7/130739322/nidopaxolimifu.pdfIn PDF document text
    • http://matras-24.ru/98281163817tj0ub.pdfIn PDF document text
    • https://sifajovu.weebly.com/uploads/1/3/4/8/134874608/3139609.pdfIn PDF document text
    • https://cdn.sqhk.co/fuzomorikat/hfhgehg/dynamons_by_kizi.pdfIn PDF document text
    • http://revershjtb.site/sugixdn5e7.pdfIn PDF document text
    • https://wosobariwosamu.weebly.com/uploads/1/3/4/3/134372044/tidodajopodeke.pdfIn PDF document text
    • https://cdn.sqhk.co/pasivuzuke/0CgcLHh/gobukuvuwa.pdfIn PDF document text
    • http://klokisik.space/nezanujugagob8lid.pdfIn PDF document text
    • https://rasogumelix.weebly.com/uploads/1/3/5/4/135400304/4517316.pdfIn PDF document text
    • https://juwomazitebuden.weebly.com/uploads/1/3/1/4/131414743/1758443.pdfIn PDF document text
    • https://cdn.sqhk.co/dudugetogi/gejbhjb/bts_army_wallpaper_laptop.pdfIn PDF document text
    • https://tusigidufamem.weebly.com/uploads/1/3/5/3/135350313/5bd995.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/26475933319.pdfIn PDF document text
    • http://xofebobijo.epizy.com/bharti_infratel_annual_report_2017-_18.pdfIn PDF document text
    • http://vafikozokus.rf.gd/xeburezatirusivivabez.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/cccam_server_hack_elbeyli.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_off0000df67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF67 5388 bytes
SHA-256: c19aca0888d9bc27c724d16c3eb75bb2bef1315f6747e3e6ab3e8d0721392f9a
font_01_sfnt_off0000f1cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CD 10148 bytes
SHA-256: 0402ec8fde21e271915e726ff20b4c3e0b06a7ff4419dec6a3a69744344a6e48

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