Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecfbd13ee0d954e1…

MALICIOUS

PDF

74.7 KB Created: 2021-04-01 16:27:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 554e8311f4e82a040589f8cc7d452e8c SHA-1: a54b74ce91d318f84255ee4d311e3b93bcb5386a SHA-256: ecfbd13ee0d954e15d19f8f3f141dcc612a722eb60faef1e5f6b1f53131baecd
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, embedding numerous external URLs, with one specifically pointing to 'baarspo.ru'. The document body, though heavily obfuscated, contains keywords related to 'Gmat prep course boston', suggesting a lure for phishing or malicious redirection. 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://baarspo.ru/strik?utm_term=gmat+prep+course+boston PDF link annotation
    • https://cdn.sqhk.co/lukapokobejo/YLifagJ/vevimugekiwopivuses.pdfIn PDF document text
    • http://merovew.xyz/fluent_python_clear_concise_and_effective_programming_bookjsb9k.pdfIn PDF document text
    • http://present-mag.ru/vuvelidubunom4vbem.pdfIn PDF document text
    • https://foxenaduro.weebly.com/uploads/1/3/1/1/131164157/difesufeze.pdfIn PDF document text
    • https://kadorupadidugi.weebly.com/uploads/1/3/1/6/131636929/lamura.pdfIn PDF document text
    • https://sovopedu.weebly.com/uploads/1/3/5/3/135301682/8eead3c6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462339/normal_5ff8b63369a4b.pdfIn PDF document text
    • https://cdn.sqhk.co/xejoxoka/6fc4EmX/polynesia_adventure_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485446/normal_6034cf86344d8.pdfIn PDF document text
    • http://barcaporirternet-interbank-pe.com/255791038578ldda.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/a27eb353-cf7b-42d8-a35b-be8ad7c93bc5/29535933151.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fdbf7ca-2dc5-4801-8b2f-cecda72099c1/replacement_parts_for_craftsman_16_gallon_wet_dry_vac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/439d44ca-1f9b-42f4-b1f7-917eadb705c1/wogujivi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c06780f-9592-498c-a565-f6511914ec00/do_roku_sticks_get_hot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/284b7d6f-f3b8-4e05-bf1d-19e7fd898573/power_wheels_dune_racer_parts_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60fcb523-88c2-4448-867a-6e7afa49e97c/35866383000.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f820380f-8967-4724-9504-ed9b81952b98/tecumseh_engines_manual_lv195ea.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_off0000e995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE995 5216 bytes
SHA-256: 1bad50b2dd262b4c707cb8415cc1e8eee842452778142a57473dc23b32710fbd
font_01_sfnt_off0000fb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB33 10276 bytes
SHA-256: 520bc3be08e1f9fa838ed6656357d7c51acdd740a192a835da9f97edb661856a

Open this report in the interactive analyzer, or submit your own file for analysis.