Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f0845ba1efed8df…

MALICIOUS

PDF

78.9 KB Created: 2021-04-05 20:05:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: f2dd2baac474180ccd3fc48a6a732f02 SHA-1: e627f99768355880c879fd2f9b4acae1a0bc71d1 SHA-256: 0f0845ba1efed8df214839b193726b2f7017fe4b183367191ae07ef8777c3afe
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to malicious content. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM firings strongly suggest this purpose. The ML classifier and ClamAV detection further confirm the malicious nature of the PDF, likely serving as a lure for phishing or malware downloads.

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://druttle.ru/123?utm_term=citrix+receiver+app PDF link annotation
    • http://storeyou.store/little_shop_of_horrors_all_song_lyricshjsbf.pdfIn PDF document text
    • https://lilafigofuku.weebly.com/uploads/1/3/1/3/131398347/2956248.pdfIn PDF document text
    • http://ogranifruit.space/allahabad_university_llb_syllabusy70yz.pdfIn PDF document text
    • http://datab.vip/zigalijisevumauodf.pdfIn PDF document text
    • http://registrat.space/amma_nagamma_telugu_movie_songslyd5k.pdfIn PDF document text
    • https://xukonixivuki.weebly.com/uploads/1/3/0/9/130969652/tamozame-batugonobatukaz-xurivovonosi-risoladibefaf.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://axecheat6.xyz/xakuvubepozuwitvt0qb.pdfIn PDF document text
    • http://spain50off.info/jitadavupalibanawejukipl5t95.pdfIn PDF document text
    • http://dosodowonuraf.iblogger.org/list_of_animals_and_their_habitats.pdfIn PDF document text
    • http://lnstagramverifycentre.com/fejujovyzhmb.pdfIn PDF document text
    • https://jirorenuges.weebly.com/uploads/1/3/0/8/130874518/sowezulekuvurula.pdfIn PDF document text
    • http://citrus-fruit.space/16728459910ugy3q.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://507d1b22-ea03-4061-a262-f79425337ca2.filesusr.com/ugd/a374b9_f1764299072a468bbdcd2e009dde0f22.pdf?index=trueIn PDF document text
    • https://4e33067b-0f13-4bed-bb9c-ea95f768fd7c.filesusr.com/ugd/23924c_d4acf5fbf0ed40f29708f94509bfa77b.pdf?index=trueIn PDF document text
    • https://dc010c70-835d-4b56-8cb0-1e1bda7cab64.filesusr.com/ugd/fb576b_10bd2e7b466044c19373ccbb8467f244.pdf?index=trueIn PDF document text
    • http://lojetewope.epizy.com/45939527228.pdfIn PDF document text
    • https://1923692e-f727-4f58-80a8-3583160180e3.filesusr.com/ugd/c4ccc4_0039efc955224f6f8c787a65b1ca0794.pdf?index=trueIn PDF document text
    • https://1b6fe947-be7e-4494-9a94-f566f178d3d1.filesusr.com/ugd/89064d_7f6be01378b34e2596d9d1b9651911ae.pdf?index=trueIn PDF document text
    • http://minegavanifur.rf.gd/where_are_king_kutter_tillers_made.pdfIn PDF document text
    • https://234a0c07-d908-4261-bb83-16b3c96a9b04.filesusr.com/ugd/73e0e6_51c02c85ff744529a7163eddc1939c47.pdf?index=trueIn PDF document text
    • https://0dea665b-aaaa-42f3-a52c-f86f0fd1efa2.filesusr.com/ugd/8b9728_c0596bd133ce4910a7cc86bd1c134e89.pdf?index=trueIn PDF document text
    • https://626fb5af-1d67-41cb-86ce-204163677ff0.filesusr.com/ugd/9d869b_a40bb88d4c6043f7896522f1a5b706c2.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBC 4440 bytes
SHA-256: 1ab8b5b79e08156b2cffc704826e7630c84300514e247bff837725c3e01ae02f
font_01_sfnt_off0000fbec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEC 10712 bytes
SHA-256: 420cd3706d9db0153e39641235df41455cda1ff45329183256976ffae6013bc0
font_02_sfnt_off00012062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12062 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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