Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad13bc04c1e9d71b…

MALICIOUS

PDF

72.6 KB Created: 2021-03-01 07:00:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: f8b911a91b696e9b7fe8c75788676cf6 SHA-1: ac2124c87b9d5983797e1f795f2c4ae18850d6e6 SHA-256: ad13bc04c1e9d71bce8af10368eff78bf5ea4fff9d069512aa3773fd9424f257
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting services and are associated with link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://baarspo.ru/wix?keyword=eagles+playoff+tickets+2020 PDF link annotation
    • https://geridaradekod.weebly.com/uploads/1/3/1/4/131437552/4d119.pdfIn PDF document text
    • http://wbigs.space/doena_de_chagas_forma_agudah7u2g.pdfIn PDF document text
    • https://sidutoxa.weebly.com/uploads/1/3/4/8/134886075/5447983.pdfIn PDF document text
    • https://cdn.sqhk.co/jerivudofin/Fgfbkge/drum_set_up_position.pdfIn PDF document text
    • http://tcerkovniekupola.space/food_dudes_kitchen1xr3p.pdfIn PDF document text
    • https://tesegape.weebly.com/uploads/1/3/5/3/135387632/8006502.pdfIn PDF document text
    • http://raifaisentgo.online/ruzibinbuw3i.pdfIn PDF document text
    • https://cdn.sqhk.co/kivutuzo/gdughjw/talking_mermaid_game.pdfIn PDF document text
    • http://bosnoslovnoejelaniekupit.xyz/sotufenesivomuzakabixicbvd9.pdfIn PDF document text
    • https://fuzefiwojagolo.weebly.com/uploads/1/3/5/3/135308179/lusoma_romeramomiwav_nowozetu.pdfIn PDF document text
    • https://cdn.sqhk.co/pabelewexo/i0fzvyW/mowumupinumulexidod.pdfIn PDF document text
    • http://nickned.me/grammatica_tedesca6byq4.pdfIn PDF document text
    • http://siwosupegejolop.medianewsonline.com/75193724939.pdfIn PDF document text
    • http://sujabupinoda.scienceontheweb.net/sony_cyber_shot_dsc_h300_lens_removal.pdfIn PDF document text
    • https://pebabole.weebly.com/uploads/1/3/4/6/134698512/zapevugobez.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/nemafu/27447611019.pdfIn PDF document text
    • http://gutekuretejapoj.onlinewebshop.net/vesoguvakivu.pdfIn PDF document text
    • https://s3.amazonaws.com/gafedupeba/daggerhood_achievement_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/boseturosapewesaragow.pdfIn PDF document text
    • http://niwurekatexo.atwebpages.com/staples_one_touch_stapler_wont_open.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_off0000dc7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7C 5484 bytes
SHA-256: cfb95f3963c6fa7a890db190332a94963b425011d384ae99d6ad6c17a45edf34
font_01_sfnt_off0000ef5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5B 11284 bytes
SHA-256: 35806fe5c36af123b20bab2eb7a44217688f17a9196034c51e2f94ff3e88dfd5

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