Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae277b9f1d3b023c…

MALICIOUS

PDF

72.7 KB Created: 2021-03-02 21:02:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6f1e328e2fb4e140dafb2fe3ef8e9256 SHA-1: abaff01bb8f947dd672f220706d336bb2f730da3 SHA-256: ae277b9f1d3b023c1220c103c536bf5b9fe2f0e3e32c96886027b87df15a77eb
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable domains and appear to be part of a link farm. The document body, though heavily obfuscated, contains a URL that suggests a lure related to workouts. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/123?utm_term=intense+glute+workout+with+resistance+bands PDF link annotation
    • http://xitnet.fun/kumofureluwogapoxuduxigo0nv1.pdfIn PDF document text
    • http://form-lnstagramcopyrightservices.com/8535163842oatwg.pdfIn PDF document text
    • https://xuvosaxefon.weebly.com/uploads/1/3/4/6/134605895/e3631.pdfIn PDF document text
    • https://tezilejesitox.weebly.com/uploads/1/3/1/1/131163634/joxumevewagixaro.pdfIn PDF document text
    • https://fatomomome.weebly.com/uploads/1/3/1/6/131606630/d123749cfa6.pdfIn PDF document text
    • https://remogomati.weebly.com/uploads/1/3/4/7/134748537/kotodibojex.pdfIn PDF document text
    • https://ranalugepileli.weebly.com/uploads/1/3/4/7/134735155/bd33d6e107e3.pdfIn PDF document text
    • http://wewogokuwidu.mywebcommunity.org/vox_ac15_heritage_handwired_head.pdfIn PDF document text
    • https://nujokolove.weebly.com/uploads/1/3/0/8/130874035/givojalutefipas-jukikuxi-tujimuxadas.pdfIn PDF document text
    • http://modernstyle.pro/enfoque_conductista_en_la_educacionagakb.pdfIn PDF document text
    • https://lujinelux.weebly.com/uploads/1/3/4/3/134361227/2782821.pdfIn PDF document text
    • http://arm-watch3.club/finding_sales_tax_worksheetej6xa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/granny_mod_menu_apk_for_android.pdfIn PDF document text
    • http://noratev.myartsonline.com/minolta_srt_201_images.pdfIn PDF document text
    • https://s3.amazonaws.com/tobojelusiwi/netflix_android_tv_apk_6.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/gojogonulafunutog.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_off0000dfee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEE 5432 bytes
SHA-256: 10ce25b912b2bf32a009d2fcb1297846d750c8e7073287b0ab26079ba7012a35
font_01_sfnt_off0000f271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF271 10308 bytes
SHA-256: fdc7da02898d22d65059866f5094856141ba92bdacab94df830fe7019208d61e

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