Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3df722bfe8639d2…

MALICIOUS

PDF

105.8 KB Created: 2021-03-22 20:49:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 6a4c630940aca44132423be599823e3d SHA-1: 413c371cb3817ea5edafa36ab3122cd9bb02c2a1 SHA-256: c3df722bfe8639d2c2d3994457c9e6c00dfcfa0a0ed00ba1961c8dc36fbaed4d
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing attempt. The primary external URL, https://maypoin.ru/strik?utm_term=maserati+granturismo+mc+stradale+dimensions, appears to be a lure for users interested in car dimensions, potentially redirecting to malicious content. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/strik?utm_term=maserati+granturismo+mc+stradale+dimensions PDF link annotation
    • http://nasufulorejuwe.mywebcommunity.org/tasunupavibuxojis.pdfIn PDF document text
    • https://kokopepexepu.weebly.com/uploads/1/3/1/3/131379351/05337.pdfIn PDF document text
    • http://boomua.site/seesaw_logo_picturesbki5b.pdfIn PDF document text
    • https://dunilugifesa.weebly.com/uploads/1/3/4/4/134471262/3948579.pdfIn PDF document text
    • http://about-fb-support.com/damulorojudekemofavuxubo3psmo.pdfIn PDF document text
    • http://amorexpo.com/arduino_software_linkxpf1a.pdfIn PDF document text
    • http://kukushpa.fun/cms-1450_claim_formbpf1u.pdfIn PDF document text
    • https://lixezakokigek.weebly.com/uploads/1/3/4/5/134596317/222234fe6d816e3.pdfIn PDF document text
    • https://vuduzilir.weebly.com/uploads/1/3/1/8/131857383/f8837c67e4757c.pdfIn PDF document text
    • http://vizit.store/farmer_giles_of_ham_first_edition4f7rb.pdfIn PDF document text
    • http://fanisore.sportsontheweb.net/34696362532.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://2489a575-72f7-492f-b117-28cfe4a4d2a3.filesusr.com/ugd/d81705_a674b40855524e249385c1d2a97f0366.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8ce57ee-76f6-4ec5-96d8-c58e376d4957/19726318387.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbb657ca-821d-410d-b43d-e802c0830c80/nuxudijipoluni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49a03834-6f74-4873-99fc-0deab6e02db1/what_size_is_a_52_inch_waist_in_womens_jeans.pdfIn PDF document text
    • https://f495c71d-628d-4070-9a3d-b699cbb46ba4.filesusr.com/ugd/d99ef3_13595b3c1d5249b3989883222c08e0dd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/53575c5e-963f-446d-8811-bd9dafda2729/jazisobujoperug.pdfIn PDF document text
    • https://0f285ee0-1b14-49a2-8a3e-060a2db94812.filesusr.com/ugd/4bf67f_026a4d55ada949f0b628a1ffa8b4ec01.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/49a8a318-f089-4a36-8ec4-31770b012807/58240804954.pdfIn PDF document text
    • http://jugugesazo.myartsonline.com/abscisic_acid_plant_hormone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2be61f2f-cc43-4d7b-9803-1f92a70ac779/20089152653.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E33 5144 bytes
SHA-256: 9cfe742563068b4d0e968e6f8416799c209e1af87e8db0af8ed4e2b41f306fd5
font_01_sfnt_off00014f91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F91 11528 bytes
SHA-256: 00049a982c67c701ef11b477ccfea66d327af33d2c279c2b813898430d32d1de
font_02_sfnt_off00017663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17663 16060 bytes
SHA-256: 84d5bd19c210eb3b73ecc14096ab1e56fdfb5b80ce7ba4f0052c67c0c2b02727
font_03_sfnt_off00018af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18AF6 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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