Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2dd99f02fcf399c…

MALICIOUS

PDF

81.6 KB Created: 2021-03-22 09:13:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: b85d756cb951caeea145396ca57ec81a SHA-1: d67474d7478d06b58fae4c3f438f823367d3c2b7 SHA-256: a2dd99f02fcf399c9efc3547a674fd60c3ac6e6c1f69b923cef9cbcec791827d
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic point towards an attempt to drive traffic 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://ponafet.ru/wix?keyword=compaq+ipaq+pocket+pc+h3900+series+software PDF link annotation
    • https://tusatetop.weebly.com/uploads/1/3/1/4/131408029/77b603990.pdfIn PDF document text
    • http://xadexawufomovi.sportsontheweb.net/lofosorabamu.pdfIn PDF document text
    • https://jifilebipik.weebly.com/uploads/1/3/4/3/134375607/4429225df9a.pdfIn PDF document text
    • https://budovabi.weebly.com/uploads/1/3/4/5/134510119/2852459.pdfIn PDF document text
    • http://top-salez.site/powowupibepo31cz.pdfIn PDF document text
    • https://venireza.weebly.com/uploads/1/3/5/9/135959939/6006342.pdfIn PDF document text
    • http://edayafar.xyz/cs_dosyas_oluturmap4ict.pdfIn PDF document text
    • http://seomagnat1.online/neburefoporolugip7f031.pdfIn PDF document text
    • http://de-bewertung-889562.icu/dover_nh_police_reportsdr7h8.pdfIn PDF document text
    • http://aarbuz.space/28697293785g5f63.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5902ff30-e651-486c-ac37-3e8383bfa78f.filesusr.com/ugd/f35da0_ac9d5507048e4512981f22fda92597fa.pdf?index=trueIn PDF document text
    • http://fanalejowegop.atwebpages.com/process_planning_and_cost_estimation_book.pdfIn PDF document text
    • https://ebba3e40-d49f-4cc8-b137-373bb1124918.filesusr.com/ugd/384ea4_409c53cf0f6342e9a652045230a1b452.pdf?index=trueIn PDF document text
    • https://49550882-97ce-44db-a38b-6e383bb81149.filesusr.com/ugd/062c90_7196b94324524af8a573fb5277a03f9f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1a6c9fe-e5f8-4606-bc5a-0aee00521c77/every_heart_a_doorway_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7450dd73-58d0-46d8-9d84-99af93d6ebbe/nemufo.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/is_voldemort_snake_in_fantastic_beasts_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e5a0417-6c97-4931-818d-3accd6fa32c3/dekizabogasame.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ed0725e-90c1-4493-ab46-58762201b579/big_little_lies_season_2_episode_1_review_guardian.pdfIn PDF document text
    • https://s3.amazonaws.com/dopugaxelelema/78151519048.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_off0000e90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90E 5872 bytes
SHA-256: 8ee9615420735b0907c0356be50afc04ed0856aff2d5aa3a121476fb6a2ca4d0
font_01_sfnt_off0000fcf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF2 10808 bytes
SHA-256: eea8f1cd50aaa1c146910c1314318dd6b9250333203c5bbac5a94d40b1b24dcd
font_02_sfnt_off00012207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12207 16060 bytes
SHA-256: d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7