Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c14e29cd893928b…

MALICIOUS

PDF

108.1 KB Created: 2021-05-27 16:17:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0275e2359fba2e7775baabddf1d8020f SHA-1: 3ecd5484e6c2eb6415e0dbc23c0209e5ff8affdc SHA-256: 7c14e29cd893928b235866b6c21d840a984f35f625dec2e7d3a392843312cdac
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, identified as a link farm, pointing to other PDF documents. This behavior is often associated with SEO manipulation or distributing malicious payloads. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cdn-cms.f-static.net/uploads/4445754/normal_602ca9b1cdc66.pdf In PDF document text
    • https://xereritotof.weebly.com/uploads/1/3/1/0/131070340/cdfa17315.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387919/normal_601dd7ad249e1.pdfIn PDF document text
    • https://fefedajukuda.weebly.com/uploads/1/3/1/0/131070841/revexoralowiw-lomerogupomogel-fuxevudus-suzat.pdfIn PDF document text
    • https://bevamiwe.weebly.com/uploads/1/3/0/7/130739198/2804846.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419198/normal_604e81a3aee81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488335/normal_604f6bdfe61f2.pdfIn PDF document text
    • https://ponatuxo.weebly.com/uploads/1/3/4/5/134596183/7e58b660.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392877/normal_5fc779225b669.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501212/normal_605b9be1204fa.pdfIn PDF document text
    • https://robesiso.weebly.com/uploads/1/3/4/5/134501854/ad21c59b6510f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489042/normal_60082a268f911.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365627/normal_5fdc158cb07d7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/kMuynZNWtA0/wb?keyword=what%20is%20a%20thesis%20statement%20in%20an%20informative%20speechPDF link annotation
    • https://uploads.strikinglycdn.com/files/51d56c06-bad4-4124-9478-2257cd6fca88/what_is_the_provisional_sum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a598733b-5acf-4bfb-8f4a-f70ca88b524b/jinugarudosasawogase.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b66b23d8-cf24-4e7f-9a63-1706de2313d4/gateway_b1_2nd_edition_workbook_answers_unit_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8249c08-c419-4bba-8e9b-e6d8fb5a2f2e/wijeramutixub.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_off000169f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169F6 5296 bytes
SHA-256: 306580d78252f35b9fb61ae3937a15996010ff19115366fc1aaf9c4800fe6441
font_01_sfnt_off00017be5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BE5 11580 bytes
SHA-256: 4d6a39d2af36de35bf31b021c97dddd62a0011da1e6655c67393e0e3931c1370

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