Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dd49a6e01a3e439…

MALICIOUS

PDF

74.2 KB Created: 2021-03-27 17:33:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: b7df7831d1aa45a51fe120f2e977ff31 SHA-1: 6d3e90a974b001a065f24884f9160dc33d0d96e6 SHA-256: 3dd49a6e01a3e4397af50ff7f0da27401587ad9c6c83b4bbe7c33bc17ea92257
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

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://zajinet.ru/award?keyword=agnello+di+dio+rns+accordi+pdf PDF link annotation
    • https://felelitujafi.weebly.com/uploads/1/3/5/3/135392562/5fc35a5e4623269.pdfIn PDF document text
    • http://kizijele.iblogger.org/bookmarks_toolbar_firefox_android.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • https://bigudiwox.weebly.com/uploads/1/3/5/3/135304820/fuzujejaso-fiwotupupemeva.pdfIn PDF document text
    • https://basitonivi.weebly.com/uploads/1/3/4/5/134584834/sokov.pdfIn PDF document text
    • http://nextauto02.ru/62020042328twyko.pdfIn PDF document text
    • http://zivolizukaliwa.iblogger.org/inductive_versus_deductive_reasoning.pdfIn PDF document text
    • http://dontbeshy.xyz/luwogepazobasa0kd4j.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5e1449e8-5ae4-4a15-bc7a-ee23795bc964.filesusr.com/ugd/3a34a5_6a949e142d62459dae00a70c1f047674.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8b7eacf-68f6-4107-a141-02d79c366eca/21571597624.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c74a2c0b-a2b1-4b10-82df-8c4a6510b58c/todugovefelawevonowez.pdfIn PDF document text
    • http://gogewarixisude.epizy.com/84629961137.pdfIn PDF document text
    • https://18cceff7-6d50-42ec-9d85-67184b61345e.filesusr.com/ugd/8c2e83_803111701c364ef388cd0f0fbfce58a4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a45737ed-93b0-41b4-a51e-c9955fc6e4f2/nasesokagegu.pdfIn PDF document text
    • http://zeliganav.epizy.com/54650271735.pdfIn PDF document text
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_8cc98ec656ad4e1faa7c82c01c6b3a78.pdf?index=trueIn PDF document text
    • https://0fdd9f25-8366-4660-9463-376fd915ad39.filesusr.com/ugd/c16cf9_6553a6c1ff5541668400fe69d2ec0c71.pdf?index=trueIn PDF document text
    • http://lufunuler.rf.gd/civilization_like_games_android.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_off0000de8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8B 5312 bytes
SHA-256: 9402abb74451446282588f52357a55ea16edceb1e5aefc2496340c65d3edaac1
font_01_sfnt_off0000f0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B1 12520 bytes
SHA-256: 76143accade4dc8cf17a774e006e3857ccfb175fcfa28e9efcd6cb3c315b3cf9

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