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)
MD5: ed08ada7c26e12caf42d5ef6a18f9a2b SHA-1: c028deb8fb4b91307cab5011ecd58ab40ab49eb4 SHA-256: 31aa94e187b025237e776e546a8126ff1f236be7b264b86f3a8a46666936d7a7
156 Risk Score

Malware Insights

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

The PDF document contains a deceptive title mimicking a search query to entice users to click on external links. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, suggesting a link farm or phishing campaign. ClamAV detection as Pdf.Phishing.Trojan further supports the malicious nature of the file. No scripts were extracted, but the embedded URLs and the document's structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
    • https://cdn-cms.f-static.net/uploads/4426944/normal_60672f16a4831.pdf
    • https://bafumujem.weebly.com/uploads/1/3/4/4/134498711/lexafuv.pdf
    • http://mugukix.mygamesonline.org/14029552935.pdf
    • https://cdn.sqhk.co/disonixures/gjpQhdY/defender_3_mod_apk_unlimited_all.pdf
    • https://cdn.sqhk.co/pewesopefim/jbjjNgi/allegiant_stadium_seating_chart_view.pdf
    • http://maritimog.medianewsonline.com/list_of_acids_present_in_fruits_and_vegetables.pdf
    • https://kuwuxegizeduki.weebly.com/uploads/1/3/2/6/132695805/xubobinofuzuv-taxim.pdf
    • http://baditunabupiru.mywebcommunity.org/46623828995.pdf
    • https://cdn-cms.f-static.net/uploads/4465249/normal_602bee910093b.pdf
    • https://cdn.sqhk.co/sudofeno/hm6SFzg/adding_subtitles_to_video_android.pdf
    • https://cdn.sqhk.co/bitaxukezor/igLhcUh/fidetaj.pdf
    • https://rifuxegu.weebly.com/uploads/1/3/4/5/134525143/9704917.pdf
    • https://tusidotug.weebly.com/uploads/1/3/4/4/134482214/tusop.pdf
    • https://cdn-cms.f-static.net/uploads/4394060/normal_60153f6589bb9.pdf
    • https://sopetenoredu.weebly.com/uploads/1/3/5/3/135318191/xulokesalulakid.pdf
    • https://cdn.sqhk.co/zafilivopupu/lmiarhd/template_letter_for_job_offer_uk.pdf
    • https://static.s123-cdn-static.com/uploads/4477629/normal_5ffdb0b3b9790.pdf
    • http://warixedivukinat.mygamesonline.org/glencoe_chemistry_matter_and_change_online_textbook_free.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cf4de027-7369-46c2-bf93-d69cabef2b5e.filesusr.com/ugd/868b90_e893b06f2ac04853a979899e5ee9d3c9.pdf?index=true
    • https://6632aaff-1fe9-4f1d-acb3-7d444e457837.filesusr.com/ugd/ce4b7c_d873e0edf54e404588bc5a26851c2d74.pdf?index=true
    • https://89d37d93-eaf9-4fc7-8d5e-07438b8f18e7.filesusr.com/ugd/e80f4c_df78ecd38eb14cee8e016cb2f6e11a56.pdf?index=true
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_c50e2358af2a40a9a3fe5f01d3036468.pdf?index=true
    • https://s3.amazonaws.com/kelukakeb/what_streaming_service_has_how_the_grinch_stole_christmas_canada.pdf
    • http://dogiwexor.myartsonline.com/english_grammar_book_for_class_12_up_board.pdf
    • https://s3.amazonaws.com/xupimaral/how_many_books_are_in_the_diary_of_a_wimpy_kid_collection.pdf
    • https://9fb0fece-6c2a-4f8b-8ff1-5d9ea67f5ee7.filesusr.com/ugd/f6a907_b08431bede654ab59e8a461ef36fdfb2.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

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

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