Malicious PDF — malware analysis report

Static analysis result for SHA-256 e21c8a06d1cb9989…

MALICIOUS

PDF

75.6 KB Created: 2021-05-27 04:15:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a48caedc5b9c778685198f338bda5434 SHA-1: b2bd099bb60a8a53ebace700a3e63c98dcb747f5 SHA-256: e21c8a06d1cb99897961dbd7e2908368054181464177f000328e1dbe2c6fad3d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one pointing to a suspicious domain ('resalured.ru') that is likely part of a link farm or phishing operation. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest an attempt to redirect users to malicious content, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/wb?keyword=un%20puente%20hacia%20terabithia%20esta%20en%20netflix
    • https://static.s123-cdn-static.com/uploads/4490251/normal_5fc7c7b6116a5.pdf
    • https://cdn-cms.f-static.net/uploads/4393499/normal_60494e30c190d.pdf
    • https://cdn-cms.f-static.net/uploads/4389090/normal_6042fb67bef7f.pdf
    • https://cdn-cms.f-static.net/uploads/4444626/normal_60640f35cc96e.pdf
    • https://fekukutetixamam.weebly.com/uploads/1/3/4/6/134636283/c6ac69d49b83a7c.pdf
    • https://cdn-cms.f-static.net/uploads/4415080/normal_5fd2e15c2b946.pdf
    • https://detaxotipag.weebly.com/uploads/1/3/4/7/134730838/5063061.pdf
    • https://pukelubaluwo.weebly.com/uploads/1/3/4/7/134741361/41cebb3dc13.pdf
    • https://lififotepul.weebly.com/uploads/1/3/4/3/134339298/3824070.pdf
    • https://namoniwuxixipej.weebly.com/uploads/1/3/4/6/134606628/717473.pdf
    • https://cdn-cms.f-static.net/uploads/4421199/normal_60383e7b167de.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/fda9b897-37fe-4cd5-96be-63646ddd7743/49367820209.pdf
    • https://uploads.strikinglycdn.com/files/194fd241-4de2-405d-835b-d90453c8af7d/61847444332.pdf
    • https://uploads.strikinglycdn.com/files/8071ddd8-3337-4cf0-8565-baa7d4aace2c/facebook_marketplace_saved_items_mobile.pdf
    • https://uploads.strikinglycdn.com/files/af568e6c-3abd-4fc5-a7d4-62c545c17b2e/kawasaki_bayou_250_oil_filter_wix.pdf
    • https://uploads.strikinglycdn.com/files/42d3f5a2-7e48-4f5c-9b3c-2ea43106557a/diff_between_first_angle_and_third_angle_projection.pdf
    • https://uploads.strikinglycdn.com/files/644bafe9-e51f-46c3-957b-70ab5da8393d/rumble_fish_full_movie_free.pdf
    • https://uploads.strikinglycdn.com/files/2026aa62-b039-412d-8bcb-0cb51214306a/how_to_pray_for_ill_person.pdf
    • https://uploads.strikinglycdn.com/files/aa821369-36be-406b-87d4-06705ad2466a/how_to_use_digitech_jamman_solo_xt_looper.pdf
    • https://uploads.strikinglycdn.com/files/60715578-0217-48d8-ac52-d7254dc33275/kinelivinezudufulatoke.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3f5.bin
aa9055677a2e30064e3b344697ee86e486bf90afcdfc18b2255827d911514e77
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F5 5304 bytes
font_01_sfnt_off0000f5fe.bin
4d82494c95d7ad4174cade4868ddb96f436b846ff60dd438a24c6feed7eddfbe
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FE 13056 bytes