Malicious PDF — malware analysis report

Static analysis result for SHA-256 d07402fb637a9a4f…

MALICIOUS

PDF

77.0 KB Created: 2021-03-08 08:13:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ada5d096a9749aa0298f2ed5f7e35e4c SHA-1: 1294a6c57e8fda276e7538c2b82183cfc7dd27bf SHA-256: d07402fb637a9a4fc580edadf0fc44cf4ad03c608da8f4f5915fc1e0d138e511
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. The embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' point towards an attempt to redirect users to potentially malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/strik?utm_term=graphic+design+charge+sheet
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/seguxewu-lugumajofibaba-kemefugefi-nonawadoluwina.pdf
    • https://cdn.sqhk.co/benibavagoge/Qxggtid/rixipazosofipe.pdf
    • https://jadusulad.weebly.com/uploads/1/3/4/7/134764450/bojisesas.pdf
    • https://cdn.sqhk.co/bitizulokiva/ghiiZ19/llama_spit_spit_app.pdf
    • https://fefugenaxidoseb.weebly.com/uploads/1/3/1/3/131380158/1020556.pdf
    • https://cdn.sqhk.co/gudupiziv/gcihgjv/helping_verbs_worksheet_with_answers.pdf
    • https://cdn.sqhk.co/zosikoto/8YhhcRy/blackberry_curve_8330_manual.pdf
    • https://cdn.sqhk.co/wakewafo/ghrgdig/defidud.pdf
    • https://cdn.sqhk.co/xonipavu/cTijjgJ/unknown_squad_survival_free_fire_battleground_3d_apk.pdf
    • https://cdn.sqhk.co/jebozibiru/dem22mx/sunshine_house_daycare_cost.pdf
    • https://cdn.sqhk.co/xenotami/oBrggif/bottle_flip_challenge_game_download.pdf
    • https://nejajabowiwuxo.weebly.com/uploads/1/3/0/7/130775705/46dc74d8.pdf
    • https://cdn.sqhk.co/satukevaguka/bsxNfp8/download_game_street_basketball_association_mod_apk.pdf
    • https://nonejazusedebe.weebly.com/uploads/1/3/6/0/136099570/kutegune.pdf
    • https://dikemogegopur.weebly.com/uploads/1/3/1/4/131406608/takowufogoxegisok.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3adbfa24-0cb9-469a-bd54-ba896a319bf4/86525256444.pdf
    • https://983c8978-ad56-435f-a988-47358aa6040c.filesusr.com/ugd/06a663_87891e0abf524be2b663f7cf3a1563dc.pdf?index=true
    • https://9a89a7da-ede3-42eb-a537-7416be21eb2d.filesusr.com/ugd/aaaf79_53c2ad1eb42f439191f46058a99bc54d.pdf?index=true
    • https://7133fc40-0b9c-4701-b953-e7fafc934b44.filesusr.com/ugd/70a38d_f2c16cad9af64359851128b7959e05fb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b94b988d-e30a-4fc6-a338-b158eb8d8ee3/student_led_conferences_reflection_sheet.pdf
    • https://uploads.strikinglycdn.com/files/fdc87370-7712-4d69-a24c-c181f488e1e8/64863289975.pdf
    • https://uploads.strikinglycdn.com/files/97149d5b-fff6-41ff-9bdd-313096444f3b/romance_of_the_three_kingdoms_14_power_up_kit_google_drive.pdf
    • https://89e5ed4a-33eb-42a6-b5f1-9fc07ea1e15b.filesusr.com/ugd/ff68bb_2eb3359e41ec4b218642ece6a605653d.pdf?index=true
    • https://944bcc21-9f45-42c2-9889-8cf837fa5d1c.filesusr.com/ugd/50f869_a7458df5bc1245c7963bd63e80cf93be.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efcb.bin
b4d4d9d92ef80504b16f3d4b292d13ad517a96b1f17b31c23ee43f7dcc04494c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCB 5336 bytes
font_01_sfnt_off000101eb.bin
e73359d0c7239c2f2aceba27e66eca1c7ffd1770c502d0bae80fa2be070cd03d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101EB 10780 bytes

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