Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d0a9f69d6c48968…

MALICIOUS

PDF

97.2 KB Created: 2021-03-29 03:12:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: adf31210bfb445ea87c93875ab26fc1a SHA-1: b2533956dbaba79fb7befabf842e873217f74171 SHA-256: 1d0a9f69d6c48968c9ac5a688d26370a68bf97966896fec4aacfe3595f214c49
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs and the heuristic findings point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://leonvi.ru/wix?keyword=laying+the+foundation+probability+answers PDF link annotation
    • https://cdn.sqhk.co/fopavege/MlQ6Kgd/popatev.pdfIn PDF document text
    • http://mavixepajifulem.scienceontheweb.net/brinkerhoff_s_success_case_method.pdfIn PDF document text
    • http://tokio-2020.fun/wivufewi0qet4.pdfIn PDF document text
    • https://cdn.sqhk.co/moserusoba/Ytriihf/mountain_climb_stunt_racing_game.pdfIn PDF document text
    • https://cdn.sqhk.co/xuluriwu/ihahjje/dizaxokifamufigodib.pdfIn PDF document text
    • https://cdn.sqhk.co/wudawagirus/sc3gegj/100073738.pdfIn PDF document text
    • https://wekosidofanepa.weebly.com/uploads/1/3/2/6/132696212/regegimexof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413121/normal_603c32d0b8ddf.pdfIn PDF document text
    • http://tricitysikhs.com/acer_aspire_one_722_release_datefqhs8.pdfIn PDF document text
    • http://lipexifinidoda.scienceontheweb.net/90099544849.pdfIn PDF document text
    • http://korogesubelokut.mypressonline.com/genetically_modified_crops_and_food_security.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411501/normal_60565493220d1.pdfIn PDF document text
    • http://fineagencyy.com/sijewexijazoniguxuduvk5dnl.pdfIn PDF document text
    • http://sushibara.net/pc_games_on_sale_rnq4ute.pdfIn PDF document text
    • https://danikobunib.weebly.com/uploads/1/3/4/7/134755608/ruwavesuzij.pdfIn PDF document text
    • https://cdn.sqhk.co/jowoluguwoge/gfvyxvF/tumblr_girl_aesthetic_drawing.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zetituri/1st_grade_sight_words_worksheets_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/anti_ragging_declaration_form_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/a_letter_images_hd_wallpaper.pdfIn PDF document text
    • http://bugenerefajujus.atwebpages.com/dofoduganu.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/giwopalex.pdfIn PDF document text
    • http://sifebitufol.onlinewebshop.net/tinalewadodidik.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001217d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217D 5580 bytes
SHA-256: ec87696077a9ee5853a9927fbf37e945f245cf25dc911584757299f89ae90c76
font_01_sfnt_off0001348b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1348B 13312 bytes
SHA-256: b509e4e32f3fdc32c1a01ab293d2e31e739bd43b2ddaec8d81c731572c792f2c
font_02_sfnt_off0001617d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1617D 16236 bytes
SHA-256: bc2abef354a82113eac5665b93bd7b389df4166cbcb558ffcabc86f148e0d671