Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb1434a50c12125c…

MALICIOUS

PDF

76.6 KB Created: 2021-04-17 01:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9e56bf2d9cfd07e43ced8b1a86d1f66 SHA-1: b88093b10bd22ce2b2871153bdd457774ebbc79d SHA-256: bb1434a50c12125cd108f6d859279f0615d31fe0bb32c473491bae79eacbfc50
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many of which are likely part of a link farm designed to direct users to malicious sites, as indicated by the PDF_SEO_LINK_FARM heuristic. The primary external URI points to a suspicious domain, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/strik?utm_term=countable+and+uncountable+nouns+exercises+primary+pdf
    • https://cdn-cms.f-static.net/uploads/4386597/normal_5fe9909229b2b.pdf
    • http://erkutungotu.com/can_i_return_something_to_ross_without_the_tagfds2b.pdf
    • https://kavavori.weebly.com/uploads/1/3/4/0/134012315/bugiba.pdf
    • https://winugemu.weebly.com/uploads/1/3/1/0/131070294/luramoniregitatuzop.pdf
    • https://cdn-cms.f-static.net/uploads/4469386/normal_60551341e74ef.pdf
    • http://coupons2020.info/spanish_english_translation_dictionary_free_downloadu9h3e.pdf
    • https://vovasodakujex.weebly.com/uploads/1/3/0/8/130874601/bamidome-dodusufipabuxa-vezon.pdf
    • https://rokolumer.weebly.com/uploads/1/3/0/9/130969153/9d2640971f34.pdf
    • https://lefiluke.weebly.com/uploads/1/3/4/8/134887161/8380770.pdf
    • http://yogistika.space/nasofivigilegujokizonv8v.pdf
    • https://ronifevux.weebly.com/uploads/1/3/4/7/134737402/01d2f9.pdf
    • http://metalllift.ru/difference_between_polytropic_and_isentropic_processt47cr.pdf
    • http://seplafond.xyz/cub_scout_bear_requirementshc6x2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/f59d9386-6eee-4896-ad38-79e41ee25f11/anne_rice_the_witching_hour.pdf
    • https://uploads.strikinglycdn.com/files/1f746f69-3830-48e2-a4e7-f3235bf3ba59/half_broke_horses_review_new_york_times.pdf
    • https://uploads.strikinglycdn.com/files/803d39a9-baa9-45d5-a9ff-47ad2a3df534/zugaxenol.pdf
    • https://uploads.strikinglycdn.com/files/12dff8a9-c964-466a-826b-09c845d7686d/what_is_being_in_charge_of_a_vehicle.pdf
    • https://uploads.strikinglycdn.com/files/9f7d9700-d8c1-4d7c-a851-f5925fbc7391/kafumikeziki.pdf
    • https://uploads.strikinglycdn.com/files/493a66ce-ebba-49ce-972b-b4477afecb62/after_2_movie_release_date_2020.pdf
    • https://uploads.strikinglycdn.com/files/cfd26697-5223-4c7d-bfc2-5a35ed797198/97741989843.pdf
    • https://uploads.strikinglycdn.com/files/8e02e8b6-79cd-4a86-91ea-85595a864e01/the_betrothed_kiera_cass_2.pdf
    • https://uploads.strikinglycdn.com/files/ec1124f1-2784-41e9-93c6-3712e41f58a4/74892367547.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df9c.bin
7b9e66f6eccd756eb53cd1f0606ce643d44ac597ad57f72e29e0c428f9b1582f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9C 5516 bytes
font_01_sfnt_off0000f24c.bin
0b31eb1806f387ff9c3dd65ae4f0391cda38653237a7ea9617e3ad0fdd30b322		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF24C 10440 bytes
font_02_sfnt_off000115de.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115DE 4324 bytes

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