Malicious PDF — malware analysis report

Static analysis result for SHA-256 10ba0c22d84e89f0…

MALICIOUS

PDF

77.9 KB Created: 2021-03-24 00:25:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d32dfe5ea53fb6f17387105cb90fc325 SHA-1: 1d14a622246b7f80b891355437625aaed28e8f61 SHA-256: 10ba0c22d84e89f0e8adfa4e78b649a6ccc73850f749359370f36f56dec32f89
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF format can embed JavaScript, which could be used to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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
  • 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://ponafet.ru/strik?utm_term=star+trek+movies
    • http://warowusavi.mywebcommunity.org/graco_nautilus_3_in_1_car_seat_replacement_straps.pdf
    • https://zujomesesewega.weebly.com/uploads/1/3/4/9/134902804/3747053.pdf
    • http://zapixexarepol.medianewsonline.com/tosimibitomaja.pdf
    • https://cdn-cms.f-static.net/uploads/4480745/normal_603c4e9f221e7.pdf
    • http://figuxovutofid.mygamesonline.org/jofukakixed.pdf
    • http://kurutog.mygamesonline.org/20863902773.pdf
    • https://jerexibim.weebly.com/uploads/1/3/4/6/134654770/saduwexo.pdf
    • http://devedilazabu.medianewsonline.com/convert_byte_array_to_and_download_javascript.pdf
    • https://cdn-cms.f-static.net/uploads/4492892/normal_6016a57935ee5.pdf
    • https://static.s123-cdn-static.com/uploads/4493221/normal_5ffa089742921.pdf
    • https://bilimetib.weebly.com/uploads/1/3/4/4/134435282/zapufafix-tezirogenoniv-nasaf-jovifijoruli.pdf
    • https://donefuvo.weebly.com/uploads/1/3/1/1/131164418/ae2e9fa69a9158.pdf
    • https://wusedutewaxugag.weebly.com/uploads/1/3/1/4/131437839/8650127.pdf
    • https://dugepawegozil.weebly.com/uploads/1/3/1/6/131606694/3304381.pdf
    • https://pibusabet.weebly.com/uploads/1/3/4/6/134695111/6d972c7a147.pdf
    • https://cdn-cms.f-static.net/uploads/4409819/normal_6049bc23409fb.pdf
    • http://toluvubub.mygamesonline.org/wawiguluwozupome.pdf
    • https://kosipomorogimel.weebly.com/uploads/1/3/4/3/134307263/begerufojexuvibax.pdf
    • http://zuzorovix.scienceontheweb.net/43958984111.pdf
    • https://bogigusojuvifu.weebly.com/uploads/1/3/4/3/134316749/8785685.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bufijonewufo.onlinewebshop.net/55324626453.pdf
    • http://sogivuwe.onlinewebshop.net/rajelofomofobo.pdf
    • https://uploads.strikinglycdn.com/files/e670baec-ea9a-4444-88d5-231b266dd58b/best_robocall_blocker_app_2020.pdf
    • https://uploads.strikinglycdn.com/files/03e8de91-1135-4547-a1b3-67128107d03a/dalodanux.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_off0000f311.bin
4d9ca3204980a760684b8dd793acae1153dacd698a22cd9337f3ff2e9c268504		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF311 5028 bytes
font_01_sfnt_off0001041c.bin
a07c92762efc7ff88c514f54408c5741f86c58a71f5fe23912080728130cc378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1041C 11424 bytes

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