Malicious PDF — malware analysis report

Static analysis result for SHA-256 31aa94e187b02523…

MALICIOUS

PDF

82.2 KB Created: 2021-05-08 01:41:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: ed08ada7c26e12caf42d5ef6a18f9a2b SHA-1: c028deb8fb4b91307cab5011ecd58ab40ab49eb4 SHA-256: 31aa94e187b025237e776e546a8126ff1f236be7b264b86f3a8a46666936d7a7
186 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with many links pointing to disposable hosting and utilizing UTM parameters, indicating a likely phishing or SEO manipulation scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. Although no scripts were extracted, the PDF structure and external links are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://seumenha.ru/strik?utm_term=who+is+the+biggest+car+seller+in+the+world PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426944/normal_60672f16a4831.pdfIn PDF document text
    • https://bafumujem.weebly.com/uploads/1/3/4/4/134498711/lexafuv.pdfIn PDF document text
    • http://mugukix.mygamesonline.org/14029552935.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/what_streaming_service_has_how_the_grinch_stole_christmas_canada.pdfIn PDF document text
    • https://cdn.sqhk.co/disonixures/gjpQhdY/defender_3_mod_apk_unlimited_all.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/how_many_books_are_in_the_diary_of_a_wimpy_kid_collection.pdfIn PDF document text
    • https://cdn.sqhk.co/pewesopefim/jbjjNgi/allegiant_stadium_seating_chart_view.pdfIn PDF document text
    • http://maritimog.medianewsonline.com/list_of_acids_present_in_fruits_and_vegetables.pdfIn PDF document text
    • https://kuwuxegizeduki.weebly.com/uploads/1/3/2/6/132695805/xubobinofuzuv-taxim.pdfIn PDF document text
    • http://baditunabupiru.mywebcommunity.org/46623828995.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465249/normal_602bee910093b.pdfIn PDF document text
    • https://cdn.sqhk.co/sudofeno/hm6SFzg/adding_subtitles_to_video_android.pdfIn PDF document text
    • https://cdn.sqhk.co/bitaxukezor/igLhcUh/fidetaj.pdfIn PDF document text
    • https://rifuxegu.weebly.com/uploads/1/3/4/5/134525143/9704917.pdfIn PDF document text
    • https://tusidotug.weebly.com/uploads/1/3/4/4/134482214/tusop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394060/normal_60153f6589bb9.pdfIn PDF document text
    • https://sopetenoredu.weebly.com/uploads/1/3/5/3/135318191/xulokesalulakid.pdfIn PDF document text
    • https://cdn.sqhk.co/zafilivopupu/lmiarhd/template_letter_for_job_offer_uk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477629/normal_5ffdb0b3b9790.pdfIn PDF document text
    • http://warixedivukinat.mygamesonline.org/glencoe_chemistry_matter_and_change_online_textbook_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cf4de027-7369-46c2-bf93-d69cabef2b5e.filesusr.com/ugd/868b90_e893b06f2ac04853a979899e5ee9d3c9.pdf?index=trueIn PDF document text
    • https://6632aaff-1fe9-4f1d-acb3-7d444e457837.filesusr.com/ugd/ce4b7c_d873e0edf54e404588bc5a26851c2d74.pdf?index=trueIn PDF document text
    • https://89d37d93-eaf9-4fc7-8d5e-07438b8f18e7.filesusr.com/ugd/e80f4c_df78ecd38eb14cee8e016cb2f6e11a56.pdf?index=trueIn PDF document text
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_c50e2358af2a40a9a3fe5f01d3036468.pdf?index=trueIn PDF document text
    • http://dogiwexor.myartsonline.com/english_grammar_book_for_class_12_up_board.pdfIn PDF document text
    • https://9fb0fece-6c2a-4f8b-8ff1-5d9ea67f5ee7.filesusr.com/ugd/f6a907_b08431bede654ab59e8a461ef36fdfb2.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001084a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084A 5448 bytes
SHA-256: abad01358d30fa8f24cba22f0a457d99e648947dc05679215871601fb4a010bd
font_01_sfnt_off00011ae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE1 10756 bytes
SHA-256: 6f636fd9ea8ba9918ad19b9e5d92c3f6becbde473fc0659719e7b01b97e2a7b9