Malicious PDF — malware analysis report

Static analysis result for SHA-256 163915a1359855fa…

MALICIOUS

PDF

72.7 KB Created: 2021-05-28 15:21:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4ddd6ea503eb87db0deff13bf3405533 SHA-1: 14deb35f74798c2b971aa3bdf288643b4c1a8cb3 SHA-256: 163915a1359855fabdba78e6ab00312bf00fe5f252883c6c5815c03483f2b86a
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://soxebez.ru/strik?utm_term=phoolon+ka+taron+ka+sabka+kehna+hai+song+download+bestwap PDF link annotation
    • https://rutepoger.weebly.com/uploads/1/3/4/5/134509459/4220354.pdfIn PDF document text
    • https://towizitubozabo.weebly.com/uploads/1/3/5/4/135400713/ridamomoritumed_faxosetakedeko_felusupitabe.pdfIn PDF document text
    • https://vitumiwoz.weebly.com/uploads/1/3/4/6/134697216/fcedc4a76b2.pdfIn PDF document text
    • https://zatitobeme.weebly.com/uploads/1/3/4/0/134097178/4972465.pdfIn PDF document text
    • https://nusavudusegi.weebly.com/uploads/1/3/4/4/134444144/7928261.pdfIn PDF document text
    • https://bovejivisesuja.weebly.com/uploads/1/3/1/3/131384116/3361740.pdfIn PDF document text
    • https://xazaguzomolak.weebly.com/uploads/1/3/4/3/134375957/7250722.pdfIn PDF document text
    • https://voxonevixes.weebly.com/uploads/1/3/4/3/134383310/dosegabawo.pdfIn PDF document text
    • https://garixapevawena.weebly.com/uploads/1/3/4/4/134495328/monoseseladegi.pdfIn PDF document text
    • https://juwarojolajekol.weebly.com/uploads/1/3/4/1/134108785/gigolav.pdfIn PDF document text
    • https://molozotupinomel.weebly.com/uploads/1/3/4/3/134340336/1ad91ea6e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cac6a88e-1204-4565-86cc-e06394c3a323/kasorekidotoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d88c968a-4704-4307-8947-204eb287ca1d/nosesodelubelegujap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83b1a726-6318-4304-8f7f-d21f1c486976/91129814237.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3382300-86cb-4d15-8581-8a0ebd320586/who_played_the_goblin_in_harry_potter_deathly_hallows_part_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ecd3680-7c6e-4646-9164-8b4dae796c50/13291367108.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d45a7e0-e647-428f-8a86-7fd830960eaa/zivubizuxanolujiva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5246b560-66e4-4b87-924c-32e01ef1012a/jakuzisakip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f8189ed-e04a-4b27-a21d-1471269aafaf/wazowigojopi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bed8e1c-7752-4ae3-9ff0-402498e40edc/bizijukubor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6eb9fc6-18b3-4618-96f1-b56c4d6f8263/how_to_choose_a_good_criminal_lawyer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff30abdc-b40f-4a53-8965-404473fcb74c/roomba_980_costco_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0073f5e8-d80c-4ef4-8973-486f46410fc2/hillsborough_county_schools_closed_eta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7361b02b-ff6e-45a4-83dd-995284a040cb/75107133660.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_off0000dd34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD34 5516 bytes
SHA-256: b8858d50ad66ba4499c4544e3e3fb048220c9e15b8d6eba32ff7c0926d63362c
font_01_sfnt_off0000effe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFE 10232 bytes
SHA-256: a0e7bb497c1210ffb2e7e2b0d5de7a74b20f8f52e0791b7c10744ca98816b708