Malicious PDF — malware analysis report

Static analysis result for SHA-256 efd5bcae2cd55bbe…

MALICIOUS

PDF

67.7 KB Created: 2020-11-19 12:41:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: fbfc8423aefca6283bf67beb368099af SHA-1: ec921068b421cf1ac4cbda1ce1f7642da6d8cde4 SHA-256: efd5bcae2cd55bbe93e3408355f4b2781fcd1ba675a6ddda99a0366b9380a151
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a link farm designed for SEO manipulation. One prominent URL, 'https://trafficel.ru/strik?utm_term=tippecanoe+school+corporation+calendar+2015', is directly embedded and likely serves as the primary lure. ClamAV detection and ML classification strongly indicate malicious intent, suggesting the document is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/strik?utm_term=tippecanoe+school+corporation+calendar+2015 PDF link annotation
    • https://natorepoxikafop.weebly.com/uploads/1/3/4/3/134314237/ffa60d5e1b6dd.pdfIn PDF document text
    • https://lumozilupive.weebly.com/uploads/1/3/4/3/134336046/5f78fbe.pdfIn PDF document text
    • https://leruzifu.weebly.com/uploads/1/3/2/3/132302941/vezesenurefejazak.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/dowesitobuga/fairness_and_accuracy_in_reporting_wiki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27d98fed-3b22-40dd-9632-5b09a1574fbf/101_okey_indir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28fe7698-de00-474f-b5cb-f73e2e74b04e/gaxoxakodavex.pdfIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/facebook_ads_report.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/prestige_car_alarm_manual_5bcr10p.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/jedumaputekapegimovekexum.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/tisotoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3703016b-ea8b-4390-825c-9524bf3ef380/22930822120.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_off0000cb18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB18 5560 bytes
SHA-256: 4ffc2857944e2e1327d22193120515448eff7a25a5e8290a706568e6d5f6dbb1
font_01_sfnt_off0000de00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE00 10636 bytes
SHA-256: 1e0052d2dc075a74ed3edbc7f3583877e71c51d6afa4ba7450e10f58734cd2b2

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