Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bf35c295a69c42a…

MALICIOUS

PDF

80.4 KB Created: 2021-05-17 01:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ae6b3efd35e57fa16cb35a2763a5c54b SHA-1: 16b38d184fd067ff043433ad2fe561c2894d368d SHA-256: 0bf35c295a69c42a495a91750bc2668e9677623379ca74b027274f4548eb92af
186 Risk Score

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 0.9961

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://xezojetit.ru/strik?utm_term=do+i+get+minecraft+windows+10+for+free+if+i+have+it+on+xbox PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4466364/normal_600d112de3cac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414169/normal_6051f736e655b.pdfIn PDF document text
    • http://belplitka.ru/paradise_island_bowl_pricesieoi5.pdfIn PDF document text
    • http://bellissimo.online/free_computer_programming_books_in_hindix3v4q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505326/normal_6054bc072f572.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454054/normal_6046798deea53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490376/normal_602a776167a3a.pdfIn PDF document text
    • http://50off.pro/introduccion_con_normas_apa_ejemplo6b7lm.pdfIn PDF document text
    • http://uber-global.com/two_player_ps4_games_split_screenakhp9.pdfIn PDF document text
    • http://flymoney.net/bewiginebizapizawmedpn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ee809a51-a58d-41df-a269-13688c4e1c69.filesusr.com/ugd/5f587b_6984ee784e924d32950e0938941e72ae.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4cbafad-8de4-4653-a476-3493eaaa8f04/xupazukidu.pdfIn PDF document text
    • https://9c12218e-e157-4070-b33f-4467b3cb42bb.filesusr.com/ugd/0c60a0_ca8ee7e8b4654e368182bdc722b09e11.pdf?index=trueIn PDF document text
    • https://e8b83640-91e4-44a0-a69f-c2468797902f.filesusr.com/ugd/ee4a13_12ae723a791649049ce5d0d6dca9b079.pdf?index=trueIn PDF document text
    • https://c83cbd6e-a134-4b49-ba12-49f24c654ad9.filesusr.com/ugd/904a8b_991a1798294346f783b1a95528e99afe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/calculator_for_pc.pdfIn PDF document text
    • https://4b0cdf75-2e42-4830-99f1-bbdbaec3f661.filesusr.com/ugd/891219_7037a9ef66f64e63893709ddd752f7c3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0329aec-2e54-4ae0-8553-619da9504cd2/56052567084.pdfIn PDF document text
    • https://7e005a1c-fb68-43c1-af83-b854b6a2d282.filesusr.com/ugd/dcfb95_c8b49c94c036417badc1a2197103d1fd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dcbb0ec-d74d-4f0b-b325-9f31dc2f190e/how_to_fix_samsung_galaxy_tab_2_7.0_wont_turn_on.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/world_map_print_tapestry_wall_hanging_art_decoration.pdfIn PDF document text
    • https://d99d9bf7-a5e0-49f2-90ac-0d1bc881463d.filesusr.com/ugd/0182ef_5482e60304844fbea683cc93427fae2d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/left_behind_books_author.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77e3c01f-04d9-43ce-9e7f-fc52bc1040ee/64307322499.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae0a8224-186a-4a41-8bce-b296cfaa6795/5497061217.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/jutajaniruzegojeviper.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_off0000f92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92B 5956 bytes
SHA-256: be9577671d56993e08ad6054b32a38b1ae30c29bffcb461957d3542332ca226f
font_01_sfnt_off00010d6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6D 10944 bytes
SHA-256: d95a49c36623994268533e4cb2b15b30e9eb7f3ebd3176bc16c30718649bfacd