Malicious PDF — malware analysis report

Static analysis result for SHA-256 f494debac6d5c3c2…

MALICIOUS

PDF

80.5 KB Created: 2021-04-11 04:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 67f55bb09979d4808eb2aa8849c824d4 SHA-1: 7c8d11db8189605ff8bd89b9fbfa4df0d46d3506 SHA-256: f494debac6d5c3c2d023dc5670bfb9b9812480f906b899da8d4716067e78e888
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, and 'CLAMAV_DETECTION' confirms it is recognized as malicious. While no scripts were extracted, the document's structure and numerous URLs point towards an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=how+to+facilitate+a+domestic+violence+support+group PDF link annotation
    • http://cmbespaceclient.xyz/download_nba_2k17_for_free_ios62yop.pdfIn PDF document text
    • https://cdn.sqhk.co/riroxale/dqcibgg/bugs_bunny_carrots_from_outer_space.pdfIn PDF document text
    • https://cdn.sqhk.co/kitijorawul/M6jeghj/zomifesoripes.pdfIn PDF document text
    • http://ecosbor.net/32482029658naqiv.pdfIn PDF document text
    • https://cdn.sqhk.co/tavaxikanabu/nwhjhet/ant_colony_killer_diy.pdfIn PDF document text
    • http://jnatural.space/el_oscuro_juego_de_lucifer_2vqvow.pdfIn PDF document text
    • https://cdn.sqhk.co/vilubofi/gUeMTjc/wexoxiti.pdfIn PDF document text
    • http://azorocheat5.xyz/pobano941t0.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/fc4bd7bd-7148-47f3-95d3-4fa98d9714eb/is_53_bank_down_right_now.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ed677c5-f0e0-4f67-af44-429ee3482cd2/66895828445.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/the_shining_book_word_count.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e757ff9d-cf3f-4cf0-924a-43b6c43223b8/14491519014.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6eb95ba-591f-498d-9229-2ad8581c5310/what_are_the_types_of_dachshunds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac017ad1-12b0-4c7a-827c-f7666c6f1314/rejudomibavorigusadeles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/437075c1-51db-40bd-aa54-90a0f91a2b4e/diwaxofigebabudeluzo.pdfIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/pozipoteturokeruzezelenu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f21a6f4a-5330-411a-ad5d-ad5d8050118b/1734-aentr_series_b_app_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6b76031-6284-4bf8-ad99-93e123414e99/timex_marathon_t5k802.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e89204e-6995-4549-be76-203dbf8ace9d/how_to_use_soap_on_greenworks_pressure_washer.pdfIn PDF document text
    • https://4c8cc264-4606-483b-a6fd-3ab48ba5c15a.filesusr.com/ugd/c626f4_a6b60ae29385465d9ad4d93e37ecdb23.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wifukedot/picsart_pc_link.pdfIn PDF document text
    • https://a97be2a3-bfb5-42de-bba9-b145341b31aa.filesusr.com/ugd/1f2860_9a731b958f2c4622950a9b7e02d1cc4f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/90174775427.pdfIn PDF document text
    • https://5a11eff3-0c7a-45dd-bb89-060d4d4d2060.filesusr.com/ugd/72216b_929474fefddb4b15931fdbcc198d5ab5.pdf?index=trueIn PDF document text
    • https://bff5fdab-9fd0-4670-908b-a1308bb5a9cb.filesusr.com/ugd/227d0f_d71e36f95db84b5f9dbe65950bcd7ed0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/53489242975.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_off0000fa85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA85 5588 bytes
SHA-256: 8461d79409c1acfc5f7db879a59416e938f3ce062957b830c32e198d299c0ca4
font_01_sfnt_off00010d8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8C 11192 bytes
SHA-256: d44d7da74e209fa724dee31c6f6e9215f66a6ba8f9f2b9a5631f7bceea5d2e18