Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d04b6cc8f9e9444…

MALICIOUS

PDF

70.5 KB Created: 2021-06-14 10:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db6d83e0242cbb12cca4a9f1211e9d8d SHA-1: c894b7de986f4bec69c590b780af73000c1ce8ab SHA-256: 2d04b6cc8f9e9444dc37b0bd5a85cfdc8f139b8f051b17fcc1d4c35133f8960c
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One of the primary external URLs, 'https://coretry.ru/pbw?utm_term=html+to+pdf+format', is suspicious and likely leads to a phishing or scam page. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://coretry.ru/pbw?utm_term=html+to+pdf+format
    • https://dawujorukola.weebly.com/uploads/1/3/4/6/134683436/bc069.pdf
    • https://static.s123-cdn-static.com/uploads/4426690/normal_6001f52675cfb.pdf
    • https://riregibo.weebly.com/uploads/1/3/4/7/134771695/muguluxaladosod.pdf
    • https://cdn-cms.f-static.net/uploads/4410703/normal_5fd7e269f3599.pdf
    • https://cdn-cms.f-static.net/uploads/4469831/normal_60bc1a5caadbb.pdf
    • https://cdn-cms.f-static.net/uploads/4413851/normal_602d73f757fd7.pdf
    • https://static.s123-cdn-static.com/uploads/4378857/normal_5fe55cd5453f6.pdf
    • https://kemovovem.weebly.com/uploads/1/3/1/4/131408999/xarebe.pdf
    • https://fusazalokedukek.weebly.com/uploads/1/3/4/7/134729088/f062f8e430dd33a.pdf
    • https://tezolujekile.weebly.com/uploads/1/3/4/4/134497819/betosumotiva-xatujirerefama-wibaledokekali-larowerulin.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/76adea41-5671-46aa-a238-0fa5c342f2f3/23335497530.pdf
    • https://uploads.strikinglycdn.com/files/7591086d-14a5-45c7-b84a-d5f12b9990e3/vemufofilinederino.pdf
    • http://rixepal.pbworks.com/w/file/fetch/144637551/182763427.pdf
    • http://wojipag.pbworks.com/f/90614305681.pdf
    • http://xojipoxar.pbworks.com/f/53633014105.pdf
    • https://uploads.strikinglycdn.com/files/86f0d182-d6b4-499a-8adc-39a3de3f6cf8/geometry_rhombuses_rectangles_and_squares_worksheet_answers.pdf
    • http://banusiv.pbworks.com/f/ruposoluwefagejozidedodi.pdf
    • https://uploads.strikinglycdn.com/files/a620cf4e-cf42-4cc3-9f5a-d5d8b445cf29/zojesurixo.pdf
    • https://uploads.strikinglycdn.com/files/efc7c53a-bdd5-40dd-9f35-51d88ec65bdb/clash_of_clans_modded_server_ios.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_off0000d92f.bin
d25b98549cb0256b71e86917f622ee132c9e835dec0f1d470c3107d60917468c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD92F 4968 bytes
font_01_sfnt_off0000e9fe.bin
7e520dcfc77c03dc52e30ae00d241187d09b314d19f269b23c38ca279552ec91		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FE 10336 bytes

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