Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3923bad479d906a…

MALICIOUS

PDF

74.7 KB Created: 2021-03-11 22:43:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 820b732b838401087e39b3194a2db527 SHA-1: ce15fb4f3df7d28b0c3afa400a05a13026b88d66 SHA-256: e3923bad479d906afbff8690b4678449b17517fd4086a028c1b7ce57dbeeafc9
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The presence of URLs like 'https://vilenefex.ru/123?utm_term=ccleaner+pro+android+apk' suggests a potential lure for software downloads or phishing. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://vilenefex.ru/123?utm_term=ccleaner+pro+android+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380382/normal_5fd33032cb9e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473432/normal_60277a8a6f70e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409096/normal_602719a128922.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501482/normal_604a55e264a2b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404287/normal_5fde69fb49dcd.pdfIn PDF document text
    • https://rapodiduwegez.weebly.com/uploads/1/3/5/3/135311990/gikujuvifi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365546/normal_601dad97d5570.pdfIn PDF document text
    • http://femusawar.iblogger.org/novudopikikedagu.pdfIn PDF document text
    • http://dororuminaxa.mywebcommunity.org/gatineau_park_winter_trail_map.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483856/normal_5ffa347182f3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457298/normal_5fdc0d4aa8cbc.pdfIn PDF document text
    • http://metarapuw.mypressonline.com/what_is_darryl_worley_net_worth.pdfIn PDF document text
    • https://luluroruzole.weebly.com/uploads/1/3/0/9/130969682/177f96.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/padadutiseni/71200344366.pdfIn PDF document text
    • http://solerola.epizy.com/dream_interpretation_pregnant_female.pdfIn PDF document text
    • http://pozonijegexovu.epizy.com/78679716315.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/lineage_2_revolution_class_guide_2019.pdfIn PDF document text
    • http://wibekemuxeni.epizy.com/turnigy_9x_receiver_compatible.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E1 4684 bytes
SHA-256: 97a895511b5cc8d86f00a757ca819df8b84ec55a8257c25a40cbe5e0ff7742b2
font_01_sfnt_off0000e8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BF 11432 bytes
SHA-256: 503fa30c02ffdc9ddb76da66a29abdb57c7905a6e51964740bd8bf8e199e5cd4
font_02_sfnt_off00010f88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F88 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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