Malicious PDF — malware analysis report

Static analysis result for SHA-256 e26d88fd62252b26…

MALICIOUS

PDF

74.3 KB Created: 2021-06-07 16:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a5d62778ada91ccd537f59d7824be1c SHA-1: ad5ca3a6409902d55feb4ba960286c5bac822bf4 SHA-256: e26d88fd62252b261c74a427f8a94824654c78d32090010eda4add69191f5966
156 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, indicating a high likelihood of malicious intent. The heuristic firings suggest it functions as a link farm, directing users to numerous external PDF files, with the primary URL being `https://infrive.ru/pbw?utm_term=is+smadav+a+virus`. The document body, though heavily obfuscated, contains metadata related to its creation, which does not directly reveal the malicious payload but supports the link farm and potential phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/pbw?utm_term=is+smadav+a+virus
    • https://fazukowabawubi.weebly.com/uploads/1/3/1/4/131407802/f7d4290.pdf
    • https://nimateson.weebly.com/uploads/1/3/4/8/134881528/jurowogogorax.pdf
    • https://pifeposanitu.weebly.com/uploads/1/3/4/7/134753567/11440c6826af.pdf
    • https://cdn-cms.f-static.net/uploads/4501775/normal_601ad9405fdfd.pdf
    • https://wivilunox.weebly.com/uploads/1/3/1/4/131453894/retejikaji.pdf
    • https://cdn-cms.f-static.net/uploads/4380527/normal_6051863349da2.pdf
    • https://motoburibekisi.weebly.com/uploads/1/3/4/6/134623685/notewemezakaxopuke.pdf
    • https://rajuwirorevub.weebly.com/uploads/1/3/5/3/135306937/3dc705.pdf
    • https://bipesulevawitod.weebly.com/uploads/1/3/1/4/131437914/fojibe.pdf
    • https://fumunavizagoz.weebly.com/uploads/1/3/4/2/134235019/tilupopevoguduzab.pdf
    • https://samalatedagunir.weebly.com/uploads/1/3/4/0/134040677/71c1152cafbe.pdf
    • https://xoraxabaxid.weebly.com/uploads/1/3/2/6/132682630/widelej-sajedepiloba.pdf
    • https://sugodaxekot.weebly.com/uploads/1/3/1/8/131872070/lotafepugubezo-rexop-muxuxib-kekegovajur.pdf
    • https://nosodawef.weebly.com/uploads/1/3/4/6/134693330/zujixijerom-tonasazes-tedisexuwiwapur-gupovegofir.pdf
    • https://marelepo.weebly.com/uploads/1/3/0/7/130738501/909744.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e772e888-04c6-4b79-a6e7-383f1149b76a/lost_in_yonkers_neil_simon.pdf
    • https://uploads.strikinglycdn.com/files/f7d91a9d-197b-4a57-b8ab-afda65381429/92380012881.pdf
    • https://uploads.strikinglycdn.com/files/5ee38f46-4bfc-4295-a5eb-8eef46417cef/99241904746.pdf
    • https://uploads.strikinglycdn.com/files/67801eeb-f11e-4bdc-ba72-0093a75993e2/timeline_of_western_philosophy.pdf
    • https://uploads.strikinglycdn.com/files/bccd463d-8e5f-4973-8a53-e43880c00e35/60302069927.pdf
    • https://uploads.strikinglycdn.com/files/9b3fde0e-3914-4ab3-894b-6b57d04c240a/23686659008.pdf
    • https://uploads.strikinglycdn.com/files/e029bfad-81f8-4165-b8db-8c3d8395f64a/jamureri.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e782.bin
c59b5c416a9a01c88081df812be459cfb37bda48878345e3e995493b69855f2b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE782 4936 bytes
font_01_sfnt_off0000f836.bin
d700ccb174d42ae84f07bd3d4f11001e187986c53921d71c55519f164df5ece5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF836 10148 bytes