Malicious PDF — malware analysis report

Static analysis result for SHA-256 d77528c5c9f39236…

MALICIOUS

PDF

79.8 KB Created: 2021-01-02 12:05:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 1145536d103267dff3f745bc440ef466 SHA-1: 35dded998d07862fb3bab223d1d020ce74cb8254 SHA-256: d77528c5c9f39236a57a9e11f76d1ce5de8b34f58585e1029b0737d37ffa9e5f
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a link farm, indicating a large number of external links. The document body, though truncated, suggests a lure related to "standing banner template photoshop". The presence of numerous external URLs, including one flagged as potentially malicious, strongly suggests a phishing or SEO spam campaign. While no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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=standing+banner+template+photoshop PDF link annotation
    • https://kanapikimafu.weebly.com/uploads/1/3/3/9/133997195/jasona_pezinu_tivosufezineveb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414174/normal_5f95af83bb12c.pdfIn PDF document text
    • https://buvojitode.weebly.com/uploads/1/3/4/6/134630820/754cb62edfd2196.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450156/normal_5fba6febc212d.pdfIn PDF document text
    • https://cdn.sqhk.co/latusetime/ijbijfq/83945331205.pdfIn PDF document text
    • https://cdn.sqhk.co/xaxovowupofa/vgcaibc/80523402884.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474475/normal_5fa8d8a594394.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416672/normal_5fef54ee4c946.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/wozoxub/gowuxes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/963ade9b-9a1b-40a5-a96b-5e2d62410cea/kekitosazadarupadufam.pdfIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/abate_of_michigan_region_7.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/love_detector_test_unblocked.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/piwekopum.pdfIn PDF document text
    • https://s3.amazonaws.com/luropi/shin_chan_funny_ringtone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9425d44a-71ec-4e54-b1fb-c950f5c69845/zayn_malik_pillow_talk_mp3_download_pagalworld.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_off0000fb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB22 5616 bytes
SHA-256: 6724b1af6f3e2eafdd363211f4e406a25b5cc5864f4934bf61943ac63e2222db
font_01_sfnt_off00010e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E06 10496 bytes
SHA-256: ed9a870b5b4139552a62de4f0abcf2b7e74a3794006ede4df146469e2e861722

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