Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddad907e60e731d0…

MALICIOUS

PDF

82.9 KB Created: 2021-04-28 16:19:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 7279669db7c58075b8f3574fc5328141 SHA-1: a7bf023c6eac50bbe27b975b6052fcf15b726487 SHA-256: ddad907e60e731d0350c816d6a013cb1bfd48ed0452e0d2549e4841cc6e8d66b
184 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, specifically flagged as a phishing trojan. It contains numerous embedded URLs, with a critical finding pointing to a known malicious redirector at 'https://yafferge.ru/strik'. The document body, though heavily obfuscated, suggests a lure related to capital budgeting techniques, likely to trick users into clicking the malicious link. No scripts were extracted, but the presence of malicious redirectors and the phishing classification strongly indicate an attempt to lead the user to a harmful destination.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=tecnicas+de+presupuesto+de+capital+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4495257/normal_5ff0058ceb806.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386347/normal_5fc89af2ac540.pdfIn PDF document text
    • https://sozejelef.weebly.com/uploads/1/3/4/6/134600180/xiwiz-tolezewudimuf-gizip.pdfIn PDF document text
    • https://ponutafozo.weebly.com/uploads/1/3/4/7/134705240/11b40301.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389792/normal_5fe891078304e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383792/normal_6042ca8d64927.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446378/normal_603260fa5403a.pdfIn PDF document text
    • http://smartcreditcheck.info/tezavorawejogowvlgqj.pdfIn PDF document text
    • https://vudefuzafovafid.weebly.com/uploads/1/3/4/6/134630521/e1d5c23ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374715/normal_6046598a05499.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426697/normal_5fcf57f187923.pdfIn PDF document text
    • http://com-connexion.xyz/40171607472vq12i.pdfIn PDF document text
    • https://penomagara.weebly.com/uploads/1/3/2/6/132695387/d2b5fc3aa37c4.pdfIn PDF document text
    • http://kersita.space/235119351740njih.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://eb22cd64-ba88-4d74-9269-d2b8937e52af.filesusr.com/ugd/3b217d_aa3236c28a2d4ce3b07d6829e54833ac.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/00707672-518a-4e0c-a9f2-067952a3d2bb/way_of_the_shaman_book_7_spoilers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db35348e-ca3e-4cb7-8c06-0e21a29c6bb6/tenancy_summons_and_return_of_service_nj.pdfIn PDF document text
    • https://2df275fc-a8dd-466e-be95-33fe0afe7bed.filesusr.com/ugd/9b6d1e_88a3f07ada774937aebc66773ff28b7a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cec47af5-8289-40ef-b4cc-f82d3c504f7e/may_cause_miracles_quotes.pdfIn PDF document text
    • https://de2ee6d5-caaa-4265-b15c-40100ab77d99.filesusr.com/ugd/d43733_4e626d1f1e674000855c35c654f75509.pdf?index=trueIn PDF document text
    • https://13fad4bf-7224-44b3-802b-16842e97d241.filesusr.com/ugd/b14664_16b8338fb6ed4ff8904a21c15d1662b9.pdf?index=trueIn 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_off000105b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B8 5100 bytes
SHA-256: 468b0b670d3995724c6cd58acbef1b007c74bdbfb3f6421a1976c69926680c11
font_01_sfnt_off0001171e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171E 11572 bytes
SHA-256: 4478db6722c000334d980b1b63f4427ffc29ff99e981dce7bbc7053ae2f0a58c