Malicious PDF — malware analysis report

Static analysis result for SHA-256 688937756a8166fd…

MALICIOUS

PDF

81.9 KB Created: 2021-03-05 16:01:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: ec7b9bb3a70a2b2f46413483f75377e9 SHA-1: f14b434d56bb0939708c87663bf08a511f02af01 SHA-256: 688937756a8166fd2a664d4709d7202fc3f200e3299e3613907db070f4709fa6
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting it's part of a link farm designed to drive traffic to potentially malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via these links. The document body, though partially corrupted, contains keywords related to 'royal canin feeding guide cat' which is used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jottigo.ru/wix?keyword=royal+canin+feeding+guide+cat PDF link annotation
    • https://kanudepu.weebly.com/uploads/1/3/2/7/132740929/kasixixedubana_fadudifazefusas_mijoxewere.pdfIn PDF document text
    • https://cdn.sqhk.co/pazaxefuma/c8kjbgj/boo_boo_bunny_etsy.pdfIn PDF document text
    • https://cdn.sqhk.co/gulizate/YwMhgjc/92549210102.pdfIn PDF document text
    • https://mubuzetuwifo.weebly.com/uploads/1/3/4/7/134703000/xejigokimomopenoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484997/normal_60217b50e9dc2.pdfIn PDF document text
    • https://cdn.sqhk.co/gixezovof/ngdgf0q/54833095150.pdfIn PDF document text
    • https://watogovujun.weebly.com/uploads/1/3/4/6/134626060/1852895.pdfIn PDF document text
    • https://winofugunolef.weebly.com/uploads/1/3/4/8/134846497/tesete.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366018/normal_5ffbcb724af7d.pdfIn PDF document text
    • https://visofamawuri.weebly.com/uploads/1/3/2/3/132303269/nixabutofodurafuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365584/normal_600c1b44d969f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368230/normal_5fddbfc67aa16.pdfIn PDF document text
    • https://cdn.sqhk.co/daribugubive/MGJgdhe/xenuwezufosox.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/f162e317-b6b8-4e37-adbd-ec4371d840a7/wudebuzijir.pdfIn PDF document text
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_52ad03c2e0984c78861ee7477b67e61e.pdf?index=trueIn PDF document text
    • https://9f349447-249b-4747-956a-316fe86e371b.filesusr.com/ugd/d2b720_9dd1e3c245ce4254957f42f0a6d79009.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8664650e-da3d-4b09-b6c1-1669d0b28488/22432134725.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c391828-b5e8-45fd-b5ec-1a7ee77601b9/heil_hvac_parts_near_me.pdfIn PDF document text
    • https://f9c380c0-3c9a-404e-8c76-a924832b335c.filesusr.com/ugd/9c8fb9_fea64ae5f5704438a19d2a3b16ce8028.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6dac75f-ca77-436e-86d3-64dc14207b3f/technical_communication_process_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52923d68-05aa-46e1-baad-f137cf334301/alamo_colleges_pay_scale_2020.pdfIn PDF document text
    • https://1a6c606f-1efd-495f-9370-57f425d809fd.filesusr.com/ugd/1be480_1b923755a5484a709e2c5f8c154212fa.pdf?index=trueIn PDF document text
    • https://170a7d3c-74f0-42f5-9ead-98ae292a4922.filesusr.com/ugd/a18aa6_14ea2ee1c81440d888124ba41e2d6c8a.pdf?index=trueIn PDF document text
    • https://6c9aa500-f8d9-42a6-b8a4-5b3c562bbfc3.filesusr.com/ugd/543886_fc5212b6c95843139872eb9c6774238e.pdf?index=trueIn 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_off00010310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10310 5024 bytes
SHA-256: 8ee6fe4e96f64392507fa72a6d485357860d1993a8ce1bfd882faa3a5fb9b976
font_01_sfnt_off00011451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11451 10972 bytes
SHA-256: 3818b472ca729d78c0f86753e2eb59f393efa811b6a1111f68ae510018750475