Malicious PDF — malware analysis report

Static analysis result for SHA-256 7af2b9b46b87a952…

MALICIOUS

PDF

104.6 KB Created: 2021-04-03 00:07:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c7d4bbab1befcc4893a8d1af70fcd61e SHA-1: 7dc5fdbc6e19921a1da1568af64f87012faafd00 SHA-256: 7af2b9b46b87a952978bcf539bdc4631dace409904b8364962ad210366dd71e8
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for PDF_SEO_LINK_FARM, indicating it is part of a link farm designed to generate SEO traffic. It also contains an embedded URI pointing to 'pelibifir.ru', which is likely malicious. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://pelibifir.ru/strik?utm_term=willy+wonka+and+the+chocolate+factory+characters+2005 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426688/normal_5fd27158a2b1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496812/normal_60217ac29f77b.pdfIn PDF document text
    • https://cdn.sqhk.co/mujekesire/hdicija/brandy_piano_man_az_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/luwesefizi/gggdgiQ/drinking_balls_hurt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393018/normal_602ffb202e7d7.pdfIn PDF document text
    • https://juruditusevowe.weebly.com/uploads/1/3/5/3/135329261/peguvosi_tagafuge_feposeto.pdfIn PDF document text
    • https://totamozosapopa.weebly.com/uploads/1/3/4/7/134712517/divuviwelupatakolepe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416656/normal_6032deaf48ca4.pdfIn PDF document text
    • https://cdn.sqhk.co/bidogefapo/hhbhia5/silasasuzinulisukagerewe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/befarekogol/kobeselerefipidotipedo.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/american_pie_5_movie_filmywap.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/brothers_in_arms_3_apk_gameplay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9db2dcc3-3347-4a35-b2ae-e8a743ba620d/through_which_country_tropic_of_cancer_passes.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/10934921592.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e0de803-ede0-463f-8d88-003ae7bc316e/jojukowagokisuviwix.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/zipif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d95d90e3-6b22-47d6-812d-99dcddeba4c6/86629710524.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/microsoft_windows_10_update_manually.pdfIn PDF document text
    • https://s3.amazonaws.com/gozifep/32052876778.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb4d1c76-9cf3-4434-aa00-f545d9f2a10c/jipanigokomanu.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/fundamentals_of_corporate_finance_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/nolarifaforuxop/34378659671.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014bd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BD8 5568 bytes
SHA-256: b6da0b1c5745a1623d5fcae2e4ead77b3b39dd045cd957d429abafa5171b9628
font_01_sfnt_off00015edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EDB 11568 bytes
SHA-256: d092e7aecd749530f463d48b48e79d8846ef80a20bc80ca5134edcfbeaba88d2
font_02_sfnt_off00018618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18618 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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