Malicious PDF — malware analysis report

Static analysis result for SHA-256 2429916a6844315f…

MALICIOUS

PDF

70.2 KB Created: 2020-11-13 07:58:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: dfef3fe4aa7d5b54134ce275ca09e85b SHA-1: 15961434a568eecea9456ca357fca3bc667372db SHA-256: 2429916a6844315f75af7d178717eae7a81643daad1463ed855e38dd308dfb4f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable domains and Weebly-hosted PDFs, suggesting a link farm or SEO abuse tactic. One of the embedded URIs, 'https://trafffe.ru/aws?utm_term=distribution+board+circuit+schedule+template', indicates a potential lure related to templates, which is a common phishing vector. The presence of numerous external links and the overall structure strongly suggest an attempt to redirect users to potentially harmful content or to manipulate search engine rankings.

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
  • 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.
  • 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://trafffe.ru/aws?utm_term=distribution+board+circuit+schedule+template PDF link annotation
    • https://keregejuvuja.weebly.com/uploads/1/3/4/3/134345288/1714535.pdfIn PDF document text
    • https://gezeteweni.weebly.com/uploads/1/3/4/0/134040803/f4d39963ccc9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385197/normal_5f97d85b91990.pdfIn PDF document text
    • https://fasuwilobavofe.weebly.com/uploads/1/3/4/4/134489762/lizisu-vutupidenifoge-nazolife.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393916/normal_5fa38c07be3c2.pdfIn PDF document text
    • https://jomitapekox.weebly.com/uploads/1/3/4/3/134319499/xijule_joguweregawowun_guwum.pdfIn PDF document text
    • https://nowusunomotir.weebly.com/uploads/1/3/4/3/134314498/4c143ec05a.pdfIn PDF document text
    • https://dunufofobepo.weebly.com/uploads/1/3/4/3/134380723/4046442.pdfIn PDF document text
    • https://buvejigu.weebly.com/uploads/1/3/4/3/134386374/fidetonegudoge.pdfIn PDF document text
    • https://dubuzimonovox.weebly.com/uploads/1/3/4/3/134347386/52e35ecee6ae6a6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d1c39d4-633a-4ca6-b49d-b817dae2db9a/dijadopa.pdfIn PDF document text
    • https://s3.amazonaws.com/wulotugadag/tazib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7e749bd-4a6e-4c13-9391-bb81473ebe73/papaxe.pdfIn PDF document text
    • https://s3.amazonaws.com/kavugusepe/summer_reading_projects.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/honeywell_true_hepa_allergen_remover_hpa204.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_off0000d617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD617 5452 bytes
SHA-256: 42124712cdde1e65f4b577bb654c7c50d9c904eb8b3bdc930a509fc8bfc7933f
font_01_sfnt_off0000e872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE872 10324 bytes
SHA-256: d8f9bbf0cf0f6076a764cd5511b1655f417155df7a2b8277ca50bdcd030abea3

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