Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2b763adad60a1d5…

MALICIOUS

PDF

73.6 KB Created: 2020-11-23 12:31:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 4bfa0e2f1433e7c7e2f4ec4b97a1b030 SHA-1: d0ded4fd8d6902082d9ff08ff79f9b964dda671b SHA-256: a2b763adad60a1d5c498dd5a182906c073c2a044be22b7825ddb263f28a3b8ee
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The document body is heavily obfuscated, but the presence of numerous external links suggests a phishing or link-farming attack pattern. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/strik?utm_term=blackaby+study+bible In PDF document text
    • https://jakemujilofadam.weebly.com/uploads/1/3/1/3/131380171/kemufaf-rekarex-zilivove.pdfIn PDF document text
    • https://xivitazekovobun.weebly.com/uploads/1/3/4/5/134596583/lopif-xitenegakovup.pdfIn PDF document text
    • https://ravidaxixow.weebly.com/uploads/1/3/4/3/134315840/bepofinolixolovisi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380691/normal_5faeb9092bfa3.pdfIn PDF document text
    • https://jutovadisew.weebly.com/uploads/1/3/4/7/134720627/2315898.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451047/normal_5fb98a732f53d.pdfIn PDF document text
    • https://katolafafesol.weebly.com/uploads/1/3/4/4/134479470/de07da600.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/nefagolom/cannondale_road_bike_fitting_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/56646274278.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5c68614-184a-4201-b64d-bf796dcde339/24170525787.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6b4112d-8f9d-47b9-8d33-d5d2d348c0d9/89657933135.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8c3f3b8-42ed-4512-97d0-949685fce39c/85442833859.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/android_developer_console_api.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_off0000e38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38C 5192 bytes
SHA-256: c014dfcd09aeebf0845b5f582ff0d58aed285f0bb0f3ddd71e84720db93a5448
font_01_sfnt_off0000f551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF551 10864 bytes
SHA-256: 6ba855880041239d103aed8c239d8f1e0aaf82c6867ec49efb3ec242a6948209

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