Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cd1b08fe3d4a723…

MALICIOUS

PDF

66.7 KB Created: 2020-11-29 22:56:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 2c4788c7ebcf20fe55fa0924e6031007 SHA-1: 9d221868310938a6d9e066bd613ad4b44349d526 SHA-256: 5cd1b08fe3d4a723f4d920dbf31353002918cfe14228a07077d408468129f4b6
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://trafffe.ru/123?utm_term=teacher+assistant+sample+cover+letter PDF link annotation
    • https://jamuseramomuf.weebly.com/uploads/1/3/1/8/131871426/mugozododarulax.pdfIn PDF document text
    • https://femekeviwafuga.weebly.com/uploads/1/3/4/3/134345727/zuzawekevizok-zokoretibe-duwala.pdfIn PDF document text
    • https://piteselijofer.weebly.com/uploads/1/3/4/6/134608400/kegelogoto-kufav-tetuxe-kojijoxevevag.pdfIn PDF document text
    • https://pabovojusu.weebly.com/uploads/1/3/4/3/134339388/lavap.pdfIn PDF document text
    • https://rulomegujenuguv.weebly.com/uploads/1/3/4/3/134329868/50d89bd.pdfIn PDF document text
    • https://zobirifojufegot.weebly.com/uploads/1/3/4/3/134374070/daronokosedibi.pdfIn PDF document text
    • https://jesufapupu.weebly.com/uploads/1/3/4/7/134764637/fuzax_katupatirinel.pdfIn PDF document text
    • https://tumixivig.weebly.com/uploads/1/3/1/6/131636813/6439391.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/9e2010af-f5ea-439b-ac54-5015ef591c6a/9174024879.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/20780054163.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f7bb583-14a0-4e95-bf70-922ec5dfcad3/cactus_flower_cafe_pensacola_fl.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/it_s_skin_mask_sheet_rose.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d285e3a-4d17-4817-8dd1-a8b61559912a/manual_tsuru_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/119ec0e1-994c-42f1-a78e-c83d3c6350e6/87726055074.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_off0000c98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98B 5180 bytes
SHA-256: 5695bd597527f1ffc25bb1d18b97622491644a6580c599ce0a7d38d8efbe7157
font_01_sfnt_off0000db04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB04 10184 bytes
SHA-256: 52ff06c534721de16d003b2f0aa0ad6262f3205fdddb230c77a801e331c0621b

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