Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb44af025155e4e8…

MALICIOUS

PDF

86.0 KB Created: 2021-06-05 23:29:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 3f61a81cb6d3d72fcb790a38b32ed606 SHA-1: ea795eba7ec8d169437625dc3e620d367398eefb SHA-256: cb44af025155e4e8a6366c06552da0d8f87b82cd2c029abcde2e1ad270665a6e
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The embedded URLs, such as 'https://krisoc.ru/pbw?utm_term=dls+profile.dat+2019+download', are likely part of this redirection scheme.

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://krisoc.ru/pbw?utm_term=dls+profile.dat+2019+download PDF link annotation
    • https://paluwewokob.weebly.com/uploads/1/3/2/7/132712057/1013338.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444649/normal_605e103da73f9.pdfIn PDF document text
    • https://devogenigibef.weebly.com/uploads/1/3/4/5/134501446/madamelo_texoni_dikojisegosul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503584/normal_6046c4f3ea4d7.pdfIn PDF document text
    • https://gefosutobova.weebly.com/uploads/1/3/4/6/134647182/5549970.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462374/normal_600c98cb74300.pdfIn PDF document text
    • https://lixamekosig.weebly.com/uploads/1/3/4/3/134368733/77fd4b97a.pdfIn PDF document text
    • https://miragitoketulo.weebly.com/uploads/1/3/3/9/133997248/788611.pdfIn PDF document text
    • https://guwifanifinib.weebly.com/uploads/1/3/2/7/132740319/dd6ba04b5d5.pdfIn PDF document text
    • https://dukifuti.weebly.com/uploads/1/3/1/4/131437117/438824.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455380/normal_602ca12168c94.pdfIn PDF document text
    • https://sumeropesoxiv.weebly.com/uploads/1/3/5/3/135316328/xoxinagotid.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/18e2c925-974b-400e-afd5-1efd9f76c2b5/65216240664.pdfIn PDF document text
    • http://zuwofig.pbworks.com/w/file/fetch/144536898/scotts_turf_builder_edgeguard_mini_broadcast_spreader_settings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec38cf87-522c-484d-b899-62e4dd405fef/how_to_connect_a_tecknet_wireless_keyboard.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32f62e2c-0e68-48ca-af1b-cb24714f131c/kimefawoxazejinanidafav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8eb44881-57d3-46a0-ab7d-e2f8d1e02542/ponobadiberarunadusop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9284612f-f695-4b72-9b23-2919b4bdf476/kokisuriko.pdfIn PDF document text
    • http://fijinatuzut.pbworks.com/w/file/fetch/144683625/lafamutiruladedizasulekej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6262f3e6-b1a1-4733-8ae6-7d6cb9c212f0/12083180400.pdfIn PDF document text
    • http://rukutuxeriro.pbworks.com/f/what_is_the_difference_between_determinism_and_possibilism_school_of_thought.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf0ff7f3-8b2b-4a9c-9721-cf2364fed690/77385422125.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE73 5640 bytes
SHA-256: edcd837b38353957896943fdd43c554e7eb408e32e1df93768cafef2be08ae8b
font_01_sfnt_off000101ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CE 2232 bytes
SHA-256: 6bbe5adaea6a5f128f3f179c83b8a8e2e6f64ca2fc5798ed1c640b05aee0660b
font_02_sfnt_off00010bdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDC 11396 bytes
SHA-256: 0ecb9c24f5b4cb56b70bd6aaaa929f47cd0b15ce379b2c8f2bf576e49f38ff89
font_03_sfnt_off000132b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B5 16312 bytes
SHA-256: aad9bc0f36eadc3314e08670b59090120051e308b357201f134af3d0b781b2b0

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