Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eea9b6a8d905fcb…

MALICIOUS

PDF

81.4 KB Created: 2021-04-14 18:10:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b98d4a92ccb6b03a50e4cafdaf884f2 SHA-1: 6070b43d406c84bccfaa30fada5a0fa350c38433 SHA-256: 9eea9b6a8d905fcb63890c8195d770cddf7ad7649b0544a0c7fdcca8fa4e29f5
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 and are used in a link farm strategy, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. One prominent URL, https://golowaki.ru/strik?utm_term=black+and+decker+iron+doesn%2527t+heat+up, is presented as a search result for a common appliance issue, likely to trick the user into clicking it. ClamAV detection and ML classification confirm the malicious nature of the PDF, suggesting it's a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://golowaki.ru/strik?utm_term=black+and+decker+iron+doesn%2527t+heat+up
    • https://static.s123-cdn-static.com/uploads/4459478/normal_5ff4d084b462b.pdf
    • https://static.s123-cdn-static.com/uploads/4405195/normal_5fde8fdb0b667.pdf
    • https://static.s123-cdn-static.com/uploads/4476135/normal_5fc76f4769b03.pdf
    • https://cdn-cms.f-static.net/uploads/4485698/normal_605fba0202b19.pdf
    • https://cdn-cms.f-static.net/uploads/4460981/normal_605be23f0b7cf.pdf
    • https://cdn-cms.f-static.net/uploads/4464083/normal_603196a6dc027.pdf
    • https://cdn-cms.f-static.net/uploads/4377902/normal_6038e4ea824e7.pdf
    • https://cdn-cms.f-static.net/uploads/4455898/normal_6023cb5991cc6.pdf
    • https://static.s123-cdn-static.com/uploads/4393489/normal_5ffd28e08f53a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wazotojemov/92586881968.pdf
    • https://s3.amazonaws.com/vatosolikijike/strength_training_routine_weight_loss.pdf
    • https://c0cead0d-5248-483d-940e-95cc3acd9bde.filesusr.com/ugd/20d83a_e6448416e191468cbb8fb9f7aff7845f.pdf?index=true
    • https://s3.amazonaws.com/muvemasoxaji/51695158004.pdf
    • https://uploads.strikinglycdn.com/files/460dc970-4679-448f-9126-29dd28f29e0f/bedejuvesogafaxofagorer.pdf
    • https://201a0bc5-0eb3-4135-8969-828875a6b07d.filesusr.com/ugd/607883_3b0269e939b3457894bc9858ec8b2510.pdf?index=true
    • https://091a8774-b5bd-4fb7-8799-8d1ca0ca44ad.filesusr.com/ugd/8716ab_99eb8321f2f54353aa1134310a8c38d3.pdf?index=true
    • https://s3.amazonaws.com/gawabog/impossible_quiz_answers_level_46.pdf
    • https://uploads.strikinglycdn.com/files/2b29c6ce-fbf3-41c5-8972-1347c553625f/eliphas_levi_the_key_of_the_mysteries.pdf
    • https://7605d98d-8b17-4a41-9383-f5c8d5af9bcc.filesusr.com/ugd/2bed4c_20d0445bfaeb48f0be77acc11bed3012.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e91d409f-94b6-44cc-8806-022c9f04bb8c/69152579263.pdf
    • https://0404cab7-c021-4537-be79-420bcb2f88cc.filesusr.com/ugd/52c240_6b160b8305f94dd794e74fb0d970eb3e.pdf?index=true
    • https://233b4d2f-9c44-4004-b776-098ebc281e6f.filesusr.com/ugd/7f980c_f535d3b511c24360842ab6475c0c5251.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d9e0b295-0fd6-4e9c-af1f-f218d56d3fdc/pujetarojomiwejuwavaruba.pdf
    • https://cfff6b0e-fc0f-4d9c-a983-c0e60c8b2bfd.filesusr.com/ugd/c637e3_737932ceedf5430681f23ef3c181d2f6.pdf?index=true
    • https://acfcda0b-1795-4b40-aedc-9a0bc13047ce.filesusr.com/ugd/89c6ad_7ef83eee294e438c8a90fd83637dfc8c.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff0f.bin
6f2f1c6f0f1d3840bac24edfa9bafebc292db9a11fccde734ee3250cc8dc4de1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0F 5308 bytes
font_01_sfnt_off0001111e.bin
c25136b2b5b93791874563bfbace1d8bb1681a09096c98d9c32d0892103d3857		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1111E 11388 bytes

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