Malicious PDF — malware analysis report

Static analysis result for SHA-256 356899219289f0c6…

MALICIOUS

PDF

91.4 KB Created: 2021-03-20 21:11:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 67e962e8f89b9a993d9647076f8cf685 SHA-1: 70abd61bf8a8dd1e564bee4b79c3d28181001d7b SHA-256: 356899219289f0c64722140623d4ff74db8feda75c9c80e23df1ed7b0b9adb9e
186 Risk Score

Malware Insights

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

This PDF file is classified as malicious by ML models and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary lure appears to be search results for popular media, such as 'Star trek discovery season 2 episode 13 reddit'. No scripts were extracted, but the PDF structure and embedded URLs are indicative of a phishing campaign.

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://jacksth.ru/strik?utm_term=star+trek+discovery+season+2+episode+13+reddit PDF link annotation
    • https://zoxiniguve.weebly.com/uploads/1/3/4/5/134584112/2374744.pdfIn PDF document text
    • http://wamimexololiwam.iblogger.org/what_is_osi_model_explain_all_layers.pdfIn PDF document text
    • https://buwulikifem.weebly.com/uploads/1/3/4/5/134583505/nakazo-sobare-tojojeratu-liluzusude.pdfIn PDF document text
    • https://minaraxu.weebly.com/uploads/1/3/4/7/134765114/4dc814c2c.pdfIn PDF document text
    • https://bupowuxa.weebly.com/uploads/1/3/5/3/135317106/8368336.pdfIn PDF document text
    • https://xajapimiwumorav.weebly.com/uploads/1/3/0/7/130739235/bamedobur_soginavegukemi_xavebugamom_mipaja.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://99f4a897-b223-4833-863a-50ad465ba5d5.filesusr.com/ugd/8e2371_0d95ff24afe14f7bb98b11f7593e14c6.pdf?index=trueIn PDF document text
    • https://0bdb67af-4c57-4a6e-9706-714cc80719f5.filesusr.com/ugd/fc840b_19618381fb3440f58ece9039a3bfc428.pdf?index=trueIn PDF document text
    • https://cda84be5-0c54-4c05-8389-97bb004c798d.filesusr.com/ugd/fa9f00_c40fbbe339ac4f53a74e42096fc6d21d.pdf?index=trueIn PDF document text
    • https://9a89a7da-ede3-42eb-a537-7416be21eb2d.filesusr.com/ugd/aaaf79_0318f6b9b358434583e1a6065afd3f53.pdf?index=trueIn PDF document text
    • https://8ca15cf9-c5bf-4329-906a-32df3c7b5ab7.filesusr.com/ugd/4ca7f5_97a1d244c0f94230bbad59e259d726e4.pdf?index=trueIn PDF document text
    • https://091a8774-b5bd-4fb7-8799-8d1ca0ca44ad.filesusr.com/ugd/8716ab_b9e05462a7134a3b9db47d96ddf1bc4c.pdf?index=trueIn PDF document text
    • http://vegosazozadexe.epizy.com/53901057404.pdfIn PDF document text
    • http://futivuxofusizu.rf.gd/63405641167.pdfIn PDF document text
    • https://bdc3fad0-85dd-4e34-85f7-620d54d4ff6f.filesusr.com/ugd/10cedf_29ae5a07ad374ccb9ed2f7a59dc9eb3a.pdf?index=trueIn PDF document text
    • https://e590c0d9-b694-44fb-9862-47327b30d8b0.filesusr.com/ugd/89363e_734a423c6b2a41bdab8b176771e551d4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/towakog/cisco_packet_tracer_6._2_netacad.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/xemobipimagukamofajaledoz.pdfIn PDF document text
    • http://wesaloxovep.rf.gd/45409160846.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_off000127c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C6 5712 bytes
SHA-256: 0a8edc554a56eda1b45ac6c1cefa604d783d526b9572a1c04f18f7240d459ba5
font_01_sfnt_off00013b60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B60 10984 bytes
SHA-256: 51ba5eeeff7677a26b5fd3dc94e9639752bf393b8b7e0fa344f2c45c86782619