Malicious PDF — malware analysis report

Static analysis result for SHA-256 db89a1bd811c1677…

MALICIOUS

PDF

82.4 KB Created: 2021-03-08 23:53:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c7b0bbf2994e5564d28bc8249442c98d SHA-1: e9e496d44d4dd79c0168ed9eb7e2d9dd763356e5 SHA-256: db89a1bd811c167776b6bf1552b67062687d81cab3ad4d69a206665fc3fd9826
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for phishing or redirecting users to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of generated links, and 'PDF_SEO_UTM_REDIRECTOR_LINK' specifically points to a redirector URL used for free-download phishing. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing lure.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/strik?utm_term=what+are+the+names+of+the+12+disciples+of+god PDF link annotation
    • https://cdn.sqhk.co/gadukupuwe/oG2gimG/dizopire.pdfIn PDF document text
    • https://cdn.sqhk.co/miranilu/PjjaPmb/era_sosial_5._0.pdfIn PDF document text
    • https://cdn.sqhk.co/xuzuvazol/GzcfhhB/nfl_football_scores_week_12_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/puvegipuros/Gujhj3X/wubodoranaguvodabepenu.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/wizomoravazub/fiviwikitiw.pdfIn PDF document text
    • https://737c154f-ca75-4484-807d-9d5c19d76377.filesusr.com/ugd/7e84b7_a280c8c488e042c5ab5a3c7395e5cb18.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gozifep/wixililu.pdfIn PDF document text
    • https://c18d7360-3707-4bf1-9d6f-52ba7510fa17.filesusr.com/ugd/76cb06_5f382163abd94c36b23179c2789c1155.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fosawef/rise_of_kingdoms_lost_crusade_apkpure.pdfIn PDF document text
    • https://48e4e0df-78ce-4736-8797-27735e68dc67.filesusr.com/ugd/f3b179_cbe1a025bf644c8d9c78345c84b2f29a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/5836128651.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/mavonagirizuzobix.pdfIn PDF document text
    • https://234d5d8d-19c9-4cab-a884-dd0775662658.filesusr.com/ugd/fb7225_efc0fd52b5694bb68849208b497ce1ea.pdf?index=trueIn PDF document text
    • https://b01cffea-7a05-49e8-9781-04202a21c04b.filesusr.com/ugd/d5d855_38ac4fdb56244ff49d65b7963d35a668.pdf?index=trueIn PDF document text
    • https://4eb83289-b313-4542-b68c-79a1d4783db4.filesusr.com/ugd/f6336d_020c738a5ea843009c3d79ce3482bcda.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/baxunaf/cozy_grate_fireplace_heater_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/85888152992.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/zuredulilusukokibaju.pdfIn PDF document text
    • https://f904ef53-caa1-4f0f-8a97-c50675c03ece.filesusr.com/ugd/2f8cea_8d633d675a99415395260a69bffa8876.pdf?index=trueIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_cafc0634ae7a4e18a64a2aa1c1462647.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_off000102b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B9 5764 bytes
SHA-256: e0a1f75a457c22326aa76c3d8db40e1cacd2066ff77c34c5d5e5c17aa8ddc891
font_01_sfnt_off00011644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11644 11108 bytes
SHA-256: 5a9b9f61ab43021e0a0796ef2dbbbb8b37507a9d37285fdc51a9d9347bcc27a3