Malicious PDF — malware analysis report

Static analysis result for SHA-256 c420ff70ae89622e…

MALICIOUS

PDF

128.1 KB Created: 2021-01-13 01:02:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d348804c774af5ea946e1d723e00a255 SHA-1: 718eca4f69bfa4fe96d659655bd1ef460709a1d6 SHA-256: c420ff70ae89622edc6ecea39c06dd72439ff5d1919c9d9601aa01b830d3f250
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lead the user to malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://ggtraff.ru/123?utm_term=dell+latitude+3340+release+date In PDF document text
    • https://cdn-cms.f-static.net/uploads/4472783/normal_5fd0f16a645b3.pdfIn PDF document text
    • https://dobopekajami.weebly.com/uploads/1/3/4/3/134314215/ef15b20d8ae0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366668/normal_5fea276b5fe27.pdfIn PDF document text
    • https://cdn.sqhk.co/dalubevemex/VIifjiT/best_car_simulator_games_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368982/normal_5fb6c1b1e4944.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459623/normal_5fa82aa7ed679.pdfIn PDF document text
    • https://xaforegitada.weebly.com/uploads/1/3/1/4/131413040/eabb641.pdfIn PDF document text
    • https://cdn.sqhk.co/xozakatupab/geogfhy/thrift_savings_plan_and_401k.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/lewuli/28240277445.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/62738891947.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/bufesu.pdfIn PDF document text
    • https://s3.amazonaws.com/xezonijida/invicta_atomic_watch_manual.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_off0001ad9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD9A 5212 bytes
SHA-256: d751606c371d451cd79978aee81b75967951bedbe9bcce3ed35fbf48f83de247
font_01_sfnt_off0001bf6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF6E 16696 bytes
SHA-256: 9551cb14f1dd1cc93bcdf8e9e0bb628b185a83073487093a96866c6a96de242c

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