Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2a98ee20720c232…

MALICIOUS

PDF

81.6 KB Created: 2021-05-16 00:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a853f40ad6c0152cdd49714babeb96ec SHA-1: d1c7dba3a18ec9648a002e179936a9bbfff21bd3 SHA-256: f2a98ee20720c23282ee4b1ebefbf90c86da36f10f9756d2832aeb0bb7492caf
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'nipisod.ru', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host multiple links on disposable domains, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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=5x5+workout+program+for+beginners PDF link annotation
    • https://wabozejitikaz.weebly.com/uploads/1/3/4/4/134495441/1356469.pdfIn PDF document text
    • http://bagevelotalapam.22web.org/kejitisugabigubodeto.pdfIn PDF document text
    • https://cdn.sqhk.co/gijesali/cjbjgjf/24875078892.pdfIn PDF document text
    • https://cdn.sqhk.co/navozaxezini/fMxijgg/52348036873.pdfIn PDF document text
    • https://kuvomudoriri.weebly.com/uploads/1/3/1/4/131406544/rarewewava-turemopopuvig-jirogubo.pdfIn PDF document text
    • https://cdn.sqhk.co/mafozerekat/aHichg9/pupevosijo.pdfIn PDF document text
    • https://cdn.sqhk.co/pixorikibam/aSoEhbp/billie_eilish_hop_tiles_beating.pdfIn PDF document text
    • https://lepenenaxagonu.weebly.com/uploads/1/3/0/7/130739126/fizixizabonulozove.pdfIn PDF document text
    • https://kiziwovoxapi.weebly.com/uploads/1/3/4/6/134617524/nivirorevari.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9d1e48ad-bcd7-4831-9b7b-7108443a63b6.filesusr.com/ugd/136d07_0eaa63aff21e4a8ea442acfc6c056ac1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d93d228c-c520-427b-97c2-bcfa98d7f519/nemp_soccer_fields.pdfIn PDF document text
    • http://jijuvusibob.rf.gd/7384899926.pdfIn PDF document text
    • https://d4f1f58f-bd44-402a-a4b0-a3aa01e36dbf.filesusr.com/ugd/dffefa_88d8c2254e7a48f3a726e5ad16d34ed9.pdf?index=trueIn PDF document text
    • https://2cc3dcad-61c1-4442-8662-ca5be7cd8672.filesusr.com/ugd/71b93f_c18d6c03e3214429b793b7d94405532e.pdf?index=trueIn PDF document text
    • http://vorafudozef.rf.gd/allintitle_index_of_admin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4430321-9919-4c24-9f2b-791e9b1189d7/52989446764.pdfIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/42915942072.pdfIn PDF document text
    • https://s3.amazonaws.com/pojikovewijeja/dojafawegujetug.pdfIn PDF document text
    • https://a3c73713-be4b-4c8d-a01f-dab92ecb4e1a.filesusr.com/ugd/5df860_d3956686a9a049d39ea1cb2d8679e408.pdf?index=trueIn PDF document text
    • https://9d3edb37-11ce-4d87-b861-4f8d850d55a0.filesusr.com/ugd/0d2aa0_c468c2cd7c4f4c058fd24317418c440f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gapivegek/forms_of_id_for_employment_in_texas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3300ab2-054c-48c9-950b-7b541c2d7a65/snapper_lawn_mower_repair_shops.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_off00010000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10000 5580 bytes
SHA-256: d83a10d05f5d5de25de4d38ed5e2e3aa1048d79f057391c9cd671368a23de896
font_01_sfnt_off00011300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11300 10596 bytes
SHA-256: 8be1a46b5304bc21bd6c9534ec945939439e6e8118113f2ac0fa2593dbbe77be

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