Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d8626f31da8a977…

MALICIOUS

PDF

93.8 KB Created: 2021-05-08 16:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 44162b7e72da0c0867abcab7bfe033fd SHA-1: b397757dfd6a8d153e2f4e79b47a47fd504767f3 SHA-256: 1d8626f31da8a9771db3fac9e235c110479ad71746ad02502e8d0362d6bbe6e6
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs, with at least one pointing to a link farm on disposable hosting, suggesting a phishing or malware distribution campaign. The presence of embedded JavaScript, though not fully analyzed here, likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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/strik?utm_term=what+is+the+magnitude+of+the+work+done+by+the+force+of+friction PDF link annotation
    • https://cdn.sqhk.co/fezemepusap/pK6Jgfc/guduxufexutaki.pdfIn PDF document text
    • https://cdn.sqhk.co/moserusoba/gihgVha/stack_switch_hp_2530.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381291/normal_605a3f909cc46.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461751/normal_5fccf76a1764b.pdfIn PDF document text
    • http://naziniza.22web.org/answer_key_in_science_module_grade_9.pdfIn PDF document text
    • http://biwiroxefamir.mywebcommunity.org/mcculloch_pro_mac_610_user_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414167/normal_5feec7fdd4989.pdfIn PDF document text
    • http://lazotub.mywebcommunity.org/loctite_648_msds.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467322/normal_5fda17dbf2758.pdfIn PDF document text
    • http://ramidavukul.medianewsonline.com/pavetepivogulegiwijuga.pdfIn PDF document text
    • http://wodedutipif.medianewsonline.com/convert_octet_stream_file_to_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447912/normal_602ca1479c181.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xutenasejubibe.atwebpages.com/campbell_biology_second_canadian_edition_2nd_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bce29e97-af26-4620-8d5e-7c2e7a971f27/the_eyes_of_the_dragon_book_review.pdfIn PDF document text
    • http://jifujurudale.epizy.com/41046246351.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ceca73f-a02d-48af-86cd-f91d257c2749/gevubimuboluwuwiwosaze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8ff6c25-9077-464b-b7ce-f26e2c0783e6/jufuzitelo.pdfIn PDF document text
    • http://tonavisuma.onlinewebshop.net/79346939295.pdfIn PDF document text
    • http://pidodexogejax.myartsonline.com/agricultural_science_book.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_off00011567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11567 5812 bytes
SHA-256: 9fe7b56f21ac0ae7c1a387240ba47530f84ac92ec2fafd99139efd6411df2630
font_01_sfnt_off0001292c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1292C 12044 bytes
SHA-256: ec5e2697e74bdc5ebdedf5abd9906a217d85c3c6ca5bdb6b0da55dc71c41851f
font_02_sfnt_off000152ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152BA 16060 bytes
SHA-256: c43c81af3addadc619f1b50b0eb79006c69e58cb90abf43f7a5fbd940e22698c