Malicious PDF — malware analysis report

Static analysis result for SHA-256 801475c44675e488…

MALICIOUS

PDF

76.5 KB Created: 2021-04-14 21:11:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e5a7bcb584aae63a4d28065ab17537e4 SHA-1: 26d7f8957997f6a05ebf9d561d16dee0857e35d6 SHA-256: 801475c44675e488b6930f28c12bba94a9b61afd4cd0a57b1e6c1146a4031a22
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The document body is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf, which can be used to create malicious PDFs. No scripts were extracted, but the presence of numerous external links points to a likely attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/strik?utm_term=interior+designer+salary PDF link annotation
    • https://zunarorukozem.weebly.com/uploads/1/3/4/0/134016655/detezabe.pdfIn PDF document text
    • https://jafusakivamo.weebly.com/uploads/1/3/0/7/130739280/7925237.pdfIn PDF document text
    • http://femetorisufi.sportsontheweb.net/87027770063.pdfIn PDF document text
    • https://sifajovu.weebly.com/uploads/1/3/4/8/134874608/morome.pdfIn PDF document text
    • https://cdn.sqhk.co/sogunixe/jCjcgdY/extreme_car_simulator_2_hack_apk_download.pdfIn PDF document text
    • https://nokemodikobo.weebly.com/uploads/1/3/4/3/134308311/1190604.pdfIn PDF document text
    • https://cdn.sqhk.co/vaxikinanibu/Mjbibhf/build_a_truss_bridge_with_popsicle_sticks.pdfIn PDF document text
    • http://zisuroto.mygamesonline.org/nipenufidik.pdfIn PDF document text
    • https://somokowu.weebly.com/uploads/1/3/1/3/131383604/luvamisufe_kapetupawiv_gadexivire.pdfIn PDF document text
    • https://fizegebukuri.weebly.com/uploads/1/3/1/4/131453213/ridogidudadepo.pdfIn PDF document text
    • https://cdn.sqhk.co/mubafazus/x1JOqij/nokia_android_mobiles_below_50000.pdfIn PDF document text
    • https://vogopulopom.weebly.com/uploads/1/3/1/3/131398589/volapitupomubav-gojapu-dimadafixobilig-nidusazekajo.pdfIn PDF document text
    • https://sesirolomozanu.weebly.com/uploads/1/3/2/7/132741009/4329520.pdfIn PDF document text
    • http://delinapod.mypressonline.com/activity_based_learning_in_mathematics.pdfIn PDF document text
    • https://cdn.sqhk.co/zibavuna/tx9Agez/call_recorder_hide_app_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/rosisole/ifuQZhf/57021010716.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://roteniju.rf.gd/82618109402.pdfIn PDF document text
    • http://didefiwofiko.rf.gd/calorie_calculator_for_fruits_and_vegetables.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5126b701-ec74-4991-a9e9-ad7c015a32d1/kuwasozajelor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee4d86a9-bf7d-4add-9eab-6f63247957f9/polycom_vvx_410_headset.pdfIn PDF document text
    • http://jupetovujek.epizy.com/10461303095.pdfIn PDF document text
    • http://kejunem.rf.gd/how_to_sub_to_someone_on_twitch_prime.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE65 5032 bytes
SHA-256: b6965534e2501ea20004475f6edde1b772fc1607c70d755b471b87049f4702d4
font_01_sfnt_off0000ff93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF93 11016 bytes
SHA-256: 017003e3c0d8718dab01f00836333dc308209c90e680f35484178d91bd758e4b