Malicious PDF — malware analysis report

Static analysis result for SHA-256 46e8b2af20965953…

MALICIOUS

PDF

69.7 KB Created: 2021-06-07 11:20:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a8c801aebd2263572622e752292db6de SHA-1: 956266577e801aa449599f0f9644dba6e173138d SHA-256: 46e8b2af20965953400bf95ae923e44a27104242de75d743d35be687c5607872
194 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm designed for SEO manipulation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' point to a tactic of overwhelming the user with links, disguised as relevant content, to achieve a malicious goal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://laborke.ru/pbw?utm_term=computer+programming+book+bangla+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379842/normal_5fd5fbfc2109c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391649/normal_601ccea262fe8.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4408878/normal_60b0018292ecf.pdfIn PDF document text
    • https://dizubegunusu.weebly.com/uploads/1/3/4/8/134889053/nopobuvu.pdfIn PDF document text
    • https://rinugofanux.weebly.com/uploads/1/3/1/4/131437530/nenegix.pdfIn PDF document text
    • https://xuganozixebiwu.weebly.com/uploads/1/3/4/3/134311953/62b67d4bd52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392453/normal_606a5cb13bf8e.pdfIn PDF document text
    • https://xazojitov.weebly.com/uploads/1/3/1/4/131408465/675d06cb2af4.pdfIn PDF document text
    • https://jizirazizeki.weebly.com/uploads/1/3/4/5/134509590/3633911.pdfIn PDF document text
    • https://xedatuvigino.weebly.com/uploads/1/3/4/5/134580066/605076.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454045/normal_5ffae684eed5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366007/normal_606770704b30a.pdfIn PDF document text
    • https://megulotajisotem.weebly.com/uploads/1/3/4/5/134592592/meketoneg_dubumakokudik_mivapufegarivo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2b0be7f-7761-4387-b771-adde9831acae/what_does_3_beeps_mean_when_you_turn_on_computer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c560cd8-fa98-42b8-9bb2-7ba4f5377968/why_did_supernatural_stop_playing_carryon_my_wayward_son.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df2c929a-34e1-4439-81f0-0bc2177e2a80/55448434900.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae79707f-f6c0-4fde-a4ef-8b6cb6d9bb9e/jobefebo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4385b973-971c-446c-8eab-4ac21a19f901/nananiwefidokedapakido.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_off0000d486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD486 5292 bytes
SHA-256: e8884b3da6df590e1b5b6df4712ef3b99b277e278cdf6c08089ce21891cd9154
font_01_sfnt_off0000e66e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66E 10292 bytes
SHA-256: 9ea74ad7e18b63fbeb8674a1bbf33d1f37213ba8de28a3e69f310a1ae9965e5e