Malicious PDF — malware analysis report

Static analysis result for SHA-256 d27e1d925eaa7d58…

MALICIOUS

PDF

74.7 KB Created: 2021-01-17 03:43:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: ec2c99b7104c10064d226573b714a42b SHA-1: 25af17fe883d3c9f0d2ac050568ebe034431b8ee SHA-256: d27e1d925eaa7d582e8a2a2a0347a854383cb5fc644a74959717fb64ecb407a9
164 Risk Score

Malware Insights

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

The PDF contains a lure related to 'Michaels return policy clearance items' and includes numerous external links, with a critical heuristic identifying a link farm. One of the external links, 'https://traffset.ru/123?utm_term=michaels+return+policy+clearance+items', is likely part of the malicious infrastructure. The presence of a ML classifier flagging the PDF as malicious and ClamAV detection further supports its malicious nature. Although no scripts were explicitly extracted, the PDF structure and link farm suggest an attempt to redirect users to malicious content, potentially leading to a second-stage download.

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://traffset.ru/123?utm_term=michaels+return+policy+clearance+items PDF link annotation
    • https://negozikazaseju.weebly.com/uploads/1/3/4/5/134587396/ponulenekuviki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473656/normal_5ff125e631720.pdfIn PDF document text
    • https://didavetamij.weebly.com/uploads/1/3/4/3/134320859/4128513.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453338/normal_5fb987101bb80.pdfIn PDF document text
    • https://site-1178836.mozfiles.com/files/1178836/screen_recorder_with_audio_app_for_android.pdfIn PDF document text
    • https://site-1168360.mozfiles.com/files/1168360/26636844123.pdfIn PDF document text
    • https://newomuzupigew.weebly.com/uploads/1/3/4/4/134468212/4b31e2ff95.pdfIn PDF document text
    • https://sefufomoxuve.weebly.com/uploads/1/3/4/5/134528328/zizaxapixisaso.pdfIn PDF document text
    • https://dojibabebane.weebly.com/uploads/1/3/2/6/132682208/681626.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/liluvad/7843857696.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/guidelines_for_drawing_data_flow_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/beethoven_symphony_9_2nd_movement_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/kivira.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_off0000d94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94C 5164 bytes
SHA-256: 6bd8cc549972c0feaf7f50e42191580bc12a4050ac3d1e4ddbfd0a27a33c0d84
font_01_sfnt_off0000eaa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA6 10964 bytes
SHA-256: fd485f20bbabdc185056eb774d04ed7b3584b72b296c149917d0c1b08ac09a6f
font_02_sfnt_off00011002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11002 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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