Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7777cb83ee513dc…

MALICIOUS

PDF

80.0 KB Created: 2021-03-19 20:26:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 8c5d0d300176c0a38cd1e83a2910e473 SHA-1: 7d050665b932f675b4193e0008fbf010afa9a44d SHA-256: c7777cb83ee513dcccb72cf19706d1830a76bf6c2d3ec321cd9ae703e10efc0e
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/strik?utm_term=can%2527t+get+my+kitchenaid+food+processor+to+start PDF link annotation
    • http://lipoviwevaja.iblogger.org/bedowinavuvaturaxasu.pdfIn PDF document text
    • http://dulexip.22web.org/badrinath_movie_video_songs_free_hd.pdfIn PDF document text
    • https://wakutoji.weebly.com/uploads/1/3/4/3/134314583/ecbe75031b.pdfIn PDF document text
    • https://sedozexejelem.weebly.com/uploads/1/3/1/8/131871533/c33ae.pdfIn PDF document text
    • https://cdn.sqhk.co/molivovuki/WBjirgg/bus_wala_game_subway_surfers.pdfIn PDF document text
    • https://depujoseteg.weebly.com/uploads/1/3/5/3/135309287/rugokuf.pdfIn PDF document text
    • https://ligiponofejejo.weebly.com/uploads/1/3/4/3/134346234/1324634.pdfIn PDF document text
    • https://jofanota.weebly.com/uploads/1/3/2/3/132302765/nasur.pdfIn PDF document text
    • https://revafabeku.weebly.com/uploads/1/3/4/7/134708131/ruravenuwukusoguzok.pdfIn PDF document text
    • https://cdn.sqhk.co/mobirewin/jb9Rjbe/plague_m._o._d._android_10.pdfIn PDF document text
    • https://napepoxamugif.weebly.com/uploads/1/3/3/9/133997580/tukizopowesibubu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2daccc73-8708-4113-a26a-4f38906335d9.filesusr.com/ugd/f65175_533b7eca19e44ff5b9968cd6c1852f2b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e56329a-47ea-4ca2-bbcb-236ff85e3fcb/whats_it_called_when_you_put_two_words_together.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e527e2f7-3cc8-4ef8-8d19-56fb003167f0/biwudokidizarunobutetuv.pdfIn PDF document text
    • https://2863666b-9d79-467d-9aad-9eeb6dafbdf2.filesusr.com/ugd/6ee3eb_1a2d3b71a41340318783fa2ac251e80a.pdf?index=trueIn PDF document text
    • http://miwusox.rf.gd/gozirasafebijusijosij.pdfIn PDF document text
    • https://30de3caf-c510-4ce9-8691-b8280dc60d9b.filesusr.com/ugd/4980ee_502d097a5bcb4acf83d0e70cf63336c9.pdf?index=trueIn PDF document text
    • http://lexupatomenoj.epizy.com/ctet_answer_key_2020.pdfIn PDF document text
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_e80efad9956c41d5a0191183f1dc7f57.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b21fd41-fb1d-42dd-aa5f-9541239e8d12/97736889633.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_off0000fb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3F 5644 bytes
SHA-256: 6baf5bc8c746f53ee7e10a67b4385a1a49c0044ecdb166f1df1c10a6d66fc3b2
font_01_sfnt_off00010e60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E60 10696 bytes
SHA-256: b7ee27679fa3edf0ef243686e05df8fbaf36a3f3cd7ab4fb42782b3b5e0f4073