Malicious PDF — malware analysis report

Static analysis result for SHA-256 af5c48fe0e018b32…

MALICIOUS

PDF

76.9 KB Created: 2021-05-21 22:52:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b5216fcda14718db279ca33294ea3815 SHA-1: 11ef6bb2b2ec0f5cad74f269bbea1fcad21fee93 SHA-256: af5c48fe0e018b32632ce8a2839d7cc241e794350a9e8367e1f29043b734e320
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/strik?utm_term=androrat+apk+for+windows PDF link annotation
    • https://pajuzexakomujub.weebly.com/uploads/1/3/4/8/134898896/rojotarerikiki_fegerubi_rojig_gekisune.pdfIn PDF document text
    • https://peretugi.weebly.com/uploads/1/3/0/7/130739140/gugezobom-wabixagog-sivotenekeravuw-gezujivowilolaz.pdfIn PDF document text
    • https://peramixirado.weebly.com/uploads/1/3/1/6/131637131/9935870.pdfIn PDF document text
    • https://ximafirufiwazi.weebly.com/uploads/1/3/4/7/134755441/kopadiduzifezo-bujujemavakabil-dibofugogas.pdfIn PDF document text
    • https://jogofevizu.weebly.com/uploads/1/3/4/3/134348232/ac6e5ca801.pdfIn PDF document text
    • https://medumoxil.weebly.com/uploads/1/3/1/0/131070238/sojazitafe.pdfIn PDF document text
    • https://vuzowukuz.weebly.com/uploads/1/3/0/8/130814197/tarax.pdfIn PDF document text
    • https://vudeberas.weebly.com/uploads/1/3/3/9/133997553/7003738.pdfIn PDF document text
    • https://tafubevodila.weebly.com/uploads/1/3/4/0/134016741/vanejaf.pdfIn PDF document text
    • https://xowogibudul.weebly.com/uploads/1/3/4/4/134446034/3985471.pdfIn PDF document text
    • https://kigusokitog.weebly.com/uploads/1/3/5/3/135300221/e69328332f1f2b8.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/e26abd72-6eb6-4656-8ca0-c9fed15f53d5/how_to_make_gap_analysis_in_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80c1f3ec-e25b-4594-99af-bf8cdfb6a6ba/54324823030.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d493cd1-32e1-4403-9c88-4f36b50353ea/pubisoxonelanajeduvifu.pdfIn PDF document text
    • https://s3.amazonaws.com/mejobu/1400_calorie_meal_plan_for_weight_loss.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8d9571c-6cbb-4fb8-b06e-97fde60431fa/no_fear_shakespeare_king_lear_act_5_scene_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b990ff8b-5ff2-4147-ac2d-df10ff5174f7/bose_901_vi_active_equalizer.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/6755910294.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_off0000ef1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1E 5148 bytes
SHA-256: a8303c02bb9f6edf9afe6de09a2825301661eae441824885d3613f11dbf257ba
font_01_sfnt_off000100cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CB 10992 bytes
SHA-256: d4d258cfb04df519d511a2ac7fb910f88138941a1f9f17dc1619f35185eb3c9b

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