Malicious PDF — malware analysis report

Static analysis result for SHA-256 aefb9fdbb265d8a9…

MALICIOUS

PDF

73.1 KB Created: 2021-04-08 00:57:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: cea915f0f309756e82e0478c5f8055d5 SHA-1: f9366f53056a25b5a19d7a432240377b0a27384b SHA-256: aefb9fdbb265d8a96110996e9669cdb3329b4e73c68c1847326017148c33f2e9
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation scheme. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the nature of the link farm suggest an attempt to direct users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/123?utm_term=pig+ear+costume+template PDF link annotation
    • https://sojabejob.weebly.com/uploads/1/3/4/8/134890412/8889593.pdfIn PDF document text
    • https://cdn.sqhk.co/rebibenizuj/cZuVghi/55226491814.pdfIn PDF document text
    • http://epaytds.xyz/335906947417y7z5.pdfIn PDF document text
    • https://jijobowuzum.weebly.com/uploads/1/3/4/5/134590228/5264836.pdfIn PDF document text
    • http://mylic.ru/piwivatawepiksao2x.pdfIn PDF document text
    • https://cdn.sqhk.co/jimavidozeze/hC1EWib/27827288773.pdfIn PDF document text
    • http://helplnstagram-confirm.com/canon_imageclass_d320_service_manual816y0.pdfIn PDF document text
    • http://bcpreactiva-enlinea.com/phd_thesis_acknowledgement_samplejk37l.pdfIn PDF document text
    • https://cdn.sqhk.co/lazogapuvo/ibjizVt/30591989597.pdfIn PDF document text
    • https://ledajesaler.weebly.com/uploads/1/3/4/0/134041179/486702.pdfIn PDF document text
    • http://pl50off.info/26995346441ktmp5.pdfIn PDF document text
    • https://cdn.sqhk.co/sozaxejiv/gUHiehd/how_to_play_dominoes_five_up.pdfIn PDF document text
    • https://fanizoliboligom.weebly.com/uploads/1/3/1/0/131070566/4247046.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/8a488eca-9f28-46d8-9ebc-40cda62406ac/one_meal_a_day_fasting_keto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96a960b4-3160-46b6-869b-64fbef272875/premarital_counseling_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1a4ef9f-d1a8-4958-9cd5-db0bdc3540f0/lapemilozad.pdfIn PDF document text
    • https://s3.amazonaws.com/mosezavor/55314058249.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c215acb1-e683-45ba-9d3f-b25a6297a58b/gamiwodugopikagikototomag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfbfdd97-4e49-49fe-b3b6-4983c3439675/warhammer_40k_kill_team_starter_set.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/hippopotamus_as_animal_spirit_guide.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_off0000dffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFC 5256 bytes
SHA-256: f6d3e410fedc77a196d50e9e05cd048521693dd434a47ad02809e3e45dd477d0
font_01_sfnt_off0000f1ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CA 11076 bytes
SHA-256: f3efc7ae6b3a5d81aed73b655ad2b2b21745d18d1c82db0cb6034f54d3aefc04

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