Malicious PDF — malware analysis report

Static analysis result for SHA-256 80038f4b87fc97c3…

MALICIOUS

PDF

79.6 KB Created: 2021-03-31 06:35:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 5b9668e6320c197733e2f2eb2079045b SHA-1: cb86090c0d24115b8986db00a2c2d5ad476ca1de SHA-256: 80038f4b87fc97c3fa1f90b6a45d7bb2136a41ef89b8df18b3d0d8c3558a46aa
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 operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a spearphishing attachment used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/123?utm_term=beautiful+in+white+saxophone+music+sheet PDF link annotation
    • https://cdn.sqhk.co/tomubozes/hbDjbWw/ridebolodexawedikodelepi.pdfIn PDF document text
    • https://cdn.sqhk.co/badalozebale/jhXB6hG/save_me_from_the_dog_house.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481520/normal_5ff121acc5982.pdfIn PDF document text
    • https://cdn.sqhk.co/bagadogod/ijCUBhj/gekitupoxidemutajasalewoz.pdfIn PDF document text
    • http://fexevewuli.mypressonline.com/bagewowivirafibibegurafag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454277/normal_6039f47f22ec4.pdfIn PDF document text
    • http://nenegifivujaxu.mypressonline.com/pride_and_prejudice_free_movie.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a7193630-a032-4ee2-b136-33837135b76a.filesusr.com/ugd/fac845_4222e6e7dc81497089fa1fd7fee76562.pdf?index=trueIn PDF document text
    • https://fa0867c9-8cf0-46f9-bfae-aad8e49c21f3.filesusr.com/ugd/cdba2c_64fc40b1965341f78da49a86ed087f87.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/31efd5b9-e86f-406f-9d6f-ec69e5cc8cb4/how_long_do_kirkland_hearing_aid_batteries_last.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/914686a9-49a8-4bc5-ab76-40fc6f9dea13/38513852039.pdfIn PDF document text
    • http://litorow.myartsonline.com/vikud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e84d176a-aebe-4a27-a93c-047115a00da2/verizon_wifi_modem_setup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64efccb0-3e88-4a3c-a497-9282cb318dac/is_robinhood_good_for_penny_stocks.pdfIn PDF document text
    • https://0e75ab8e-f6a1-4360-bef2-1d94e06fde4e.filesusr.com/ugd/c0518c_9b40a0d65130414582dd74b061b6f0a9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd2fda2d-df17-4463-8457-3645b6234f20/whats_better_gas_or_piston_ar_15.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d008b4d9-2488-4e23-b8dd-508d6c2cfaa9/big_fish_grill_market.pdfIn PDF document text
    • http://miganuvag.myartsonline.com/24531251747.pdfIn PDF document text
    • https://94226b1b-8363-4ad6-a779-e61b7b16ff5b.filesusr.com/ugd/b3bc21_6e97be05d86343d481e5d165a423f04f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/98361721-959f-4933-a5f9-8b949242757d/8474885866.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/802b3618-6edd-48e3-ab1f-6687b65173f1/18627939870.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_off0000f8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C3 5368 bytes
SHA-256: 1fff8d536efcf84695779a2411ac98e4d126b89d1de958d050d9daca1480fc18
font_01_sfnt_off00010b05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B05 11304 bytes
SHA-256: fdd24c85d453bae92d923134afcbc43d90a57a86e0bb70367d5745e81fb8a046