Malicious PDF — malware analysis report

Static analysis result for SHA-256 daf22de675531390…

MALICIOUS

PDF

77.4 KB Created: 2021-06-09 00:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e7731b66799100d7a8a4cfb15c6f843b SHA-1: 9a7c3a8b058953fd8146f9998b826d57bdb4135a SHA-256: daf22de67553139090c8d623f116cae3a21a8917032ed8834cd7eb6388c4cd14
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 0.9991

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://philabc.ru/pbw?utm_term=transitive+intransitive+quiz PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4420438/normal_5fcedbd998008.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420903/normal_60b7b919d5984.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380707/normal_5fd626d294b98.pdfIn PDF document text
    • https://putigazabikikim.weebly.com/uploads/1/3/2/6/132682718/bc7f3b.pdfIn PDF document text
    • https://nagozexifetuli.weebly.com/uploads/1/3/4/3/134340384/bumideduxopim.pdfIn PDF document text
    • https://pefasuvut.weebly.com/uploads/1/3/4/7/134716349/mevifiwefijowodif.pdfIn PDF document text
    • https://fekukutetixamam.weebly.com/uploads/1/3/4/6/134636283/8324248.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fokojifidesi.pbworks.com/w/file/fetch/144582306/sketchup_2015_free_download_with_crack_64_bit_kickass.pdfIn PDF document text
    • http://jajafad.pbworks.com/w/file/fetch/144417534/gre_physics_practice_test_with_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e55e8700-b00b-4e52-9e2f-8c74d7f61659/nelson_essential_paediatrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18483799-c6b2-45a6-a23e-8a117de35726/how_to_conduct_a_social_science_research.pdfIn PDF document text
    • http://madatev.pbworks.com/f/divivexuw.pdfIn PDF document text
    • http://rukutuxeriro.pbworks.com/f/49962616216.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f07e9be-7cd7-4287-ad7e-0efb9f79a961/are_onn_bluetooth_earbuds_good_for_health.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d8a120c-18e2-4a69-890b-ecce3af4c19d/94393379142.pdfIn PDF document text
    • http://kufujibumufa.pbworks.com/w/file/fetch/144790929/sepen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4035fc65-2f72-42a3-b3bb-1338abf09086/14858543361.pdfIn PDF document text
    • http://kesowununak.pbworks.com/f/4089589119.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9272062c-d6b3-4f7c-b6d4-3f6ca9d055b8/75775699450.pdfIn PDF document text
    • http://fiwonotexo.pbworks.com/w/file/fetch/144868506/pukiwewoxizabikimerir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66391e4d-dddd-42ba-a9e1-2518710cb4e8/acer_aspire_5733z_camera_drivers_for_windows_7_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/472b7aa7-88e6-499a-bf1f-e5a622d6c15b/what_is_life_life_is_a_duty_kannada_song.pdfIn PDF document text
    • http://vowijeve.pbworks.com/f/prabhashakan_malayalam_bible.pdfIn PDF document text
    • http://gupipax.pbworks.com/f/67310123773.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_off0000f136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF136 4832 bytes
SHA-256: dbf795711f03516af64a2158e97a8952e6a23474e50c2d5ddf8312a4d5105c3a
font_01_sfnt_off000101bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BF 11268 bytes
SHA-256: b916aedc8c0af160c6011a23f7b3e58ba4a50369aa2e8555118e07429795de84