Malicious PDF — malware analysis report

Static analysis result for SHA-256 70c8746d07a7cda9…

MALICIOUS

PDF

78.3 KB Created: 2021-04-02 17:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 0172c2d2e66668375d2020e209d3cc82 SHA-1: e50822f7f1b00f5ee078cc446f501fa6ddeabde5 SHA-256: 70c8746d07a7cda98791b4cdd666e60c0578624d2c9f37afa54ddbeb28b8840b
244 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains a large number of embedded links, many pointing to disposable hosting services, and one specifically redirects to a known malicious URL. The document body is heavily obfuscated and appears to be junk data, suggesting the primary purpose is to host these malicious links rather than convey information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/award?keyword=geometrical+isomerism+in+alkenes+pdf In PDF document text
    • https://pijawofixogut.weebly.com/uploads/1/3/4/0/134017865/sanin-rizutipip.pdfIn PDF document text
    • https://gotizede.weebly.com/uploads/1/3/2/6/132695714/2437244.pdfIn PDF document text
    • http://zenaxudoriw.mypressonline.com/2020_afl_fixture_a4.pdfIn PDF document text
    • http://danoguvokapijof.medianewsonline.com/rotewevosamusezug.pdfIn PDF document text
    • http://quickpapp.online/jajanebisifujil2k4hu.pdfIn PDF document text
    • https://rugajasaxi.weebly.com/uploads/1/3/4/0/134096424/lomukojadufig.pdfIn PDF document text
    • https://fodonisegijiwos.weebly.com/uploads/1/3/1/4/131437376/wijarazebevezupaxini.pdfIn PDF document text
    • http://pek-24.cc/midupenekibitifubobetados8hmy7.pdfIn PDF document text
    • https://sarisakela.weebly.com/uploads/1/3/5/3/135308925/bosevewowemib.pdfIn PDF document text
    • https://tefakunuti.weebly.com/uploads/1/3/1/8/131871494/pobejefabi.pdfIn PDF document text
    • https://varowuzogan.weebly.com/uploads/1/3/1/8/131856285/gigozumojitewiz.pdfIn PDF document text
    • https://kumigovujubexug.weebly.com/uploads/1/3/0/7/130776874/3a6da8a84a51.pdfIn PDF document text
    • http://nunovoxiwanafuz.getenjoyment.net/vekid.pdfIn PDF document text
    • https://jitolubupiloz.weebly.com/uploads/1/3/4/6/134637312/78197bd5b82.pdfIn PDF document text
    • https://vedudogekikusiw.weebly.com/uploads/1/3/1/1/131164168/5024818.pdfIn PDF document text
    • https://rixabala.weebly.com/uploads/1/3/4/7/134730828/mivojumagajobi-rorizoma-zabugixovife-mewijewinaxiwa.pdfIn PDF document text
    • https://xugubevowasisof.weebly.com/uploads/1/3/4/8/134885616/vunujazej.pdfIn PDF document text
    • http://dream-stat.ru/fudexusaginikarepuxobopoamsaq.pdfIn PDF document text
    • https://durapafived.weebly.com/uploads/1/3/1/4/131438767/78bbd5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6acf0ca1-aa41-4771-8b91-54baff69ee7f.filesusr.com/ugd/7d1dc9_88b2c1248f9744a788c8aa0c7a3dc031.pdf?index=trueIn PDF document text
    • https://e53c8fcc-339b-4d8f-83f6-44ddc8c6ace4.filesusr.com/ugd/1ea9c4_83f026656b12405181ac4492f8d9834f.pdf?index=trueIn PDF document text
    • http://molagegivijoxu.onlinewebshop.net/hitachi_c10fch2_change_blade.pdfIn PDF document text
    • https://d38713d8-f9e0-49bf-8e72-3f46774ce551.filesusr.com/ugd/b3faf5_5f327cdd84524c84a8909fe482c7177d.pdf?index=trueIn PDF document text
    • https://84daacc9-7e90-4c5d-b1ed-526950900c49.filesusr.com/ugd/73f3b0_bc3c057b9b8d4206b51746276e758412.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_off0000f3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D5 5396 bytes
SHA-256: c437465721e72e01e59e2e48f8420c3d54090aefdef1fcfb3e007067db61bec7
font_01_sfnt_off0001061f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061F 10952 bytes
SHA-256: 7c89e06d40742754339d78d4fa32b59550906003462c5c41d3186991bc220387

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