Malicious PDF — malware analysis report

Static analysis result for SHA-256 77d8fa5aeacaa4b9…

MALICIOUS

PDF

75.1 KB Created: 2021-05-25 07:30:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 371a2719d94f78b40acf6b6ccafbee0d SHA-1: 76ccf02ce6f1ba1d2202d7af3de3f4a7633ad000 SHA-256: 77d8fa5aeacaa4b9fe6f2d829684cd044e1bd8e58d9122255191b448f5ed3469
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. The primary malicious activity observed is the presence of a large number of external links, forming a link farm, with one notable URL being https://soxebez.ru/strik. This suggests the document is designed to redirect users to potentially harmful websites, possibly for phishing or to distribute further malware. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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=alcoholics+anonymous+step+4+worksheet PDF link annotation
    • https://jifosibupegexuv.weebly.com/uploads/1/3/4/6/134692258/xoferusipubatuvutib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405184/normal_605f76d06f8eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485800/normal_60034c515112f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492897/normal_5ff8477751351.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483591/normal_60087100e7a25.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488809/normal_5fe1d262ba7f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468871/normal_5ffa08ee3d84b.pdfIn PDF document text
    • https://durozuxazoxete.weebly.com/uploads/1/3/4/6/134647509/fomigononalewutu.pdfIn PDF document text
    • https://pexegiwu.weebly.com/uploads/1/3/4/5/134526087/0dc90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417327/normal_601bba968ac98.pdfIn PDF document text
    • https://fusarutuzazeni.weebly.com/uploads/1/3/5/3/135346017/figajidiseg_sobipomosoxir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446038/normal_605d953c68fc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471234/normal_606b3936bf9b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404725/normal_6037cdc17e447.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373511/normal_5fdc0e61cf62e.pdfIn PDF document text
    • https://nabubane.weebly.com/uploads/1/3/6/0/136099933/3704439.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vebenok/kepogufuxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c167c38-c5d8-4514-9072-6e8526e9f5a4/what_is_the_blood_test_called_for_crp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a28b585a-8ad3-4f4b-b61e-536464e071a6/38895221316.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89741603-a4a0-430d-83ec-8a2193e6f92f/wv_prevailing_wage_rates_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/33448816669.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_off0000e7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E9 5508 bytes
SHA-256: b4c27ee31c5dcef15b5a5cdf0613fe433eaddbc5e8d06cb85b660bb18a6a7e6c
font_01_sfnt_off0000fa9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9B 10668 bytes
SHA-256: b486e0fe378e3fc28b7cf9894e2a8feb8fcf94f72073309a46a488a18f434849

Open this report in the interactive analyzer, or submit your own file for analysis.