Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c0c719cb98f25da…

MALICIOUS

PDF

76.3 KB Created: 2021-03-07 07:59:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: fe142bc836b20dc7271dc3916f9c573b SHA-1: da1ce609c0ee98890d865eabf239b4e4f7af014e SHA-256: 1c0c719cb98f25daa00d0675bb79cfb1f4e0e3b6e55bd6bf7dc1080a02280736
126 Risk Score

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. It contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or to host further malicious content. The document body, though obfuscated, suggests a lure related to 'process mapping'. No scripts were extracted, but the presence of many external URIs suggests the primary function is to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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://golowaki.ru/aws?utm_term=how+to+do+a+process+mapping PDF link annotation
    • http://birebap.scienceontheweb.net/the_hiding_place_by_corrie_ten_boom_audiobook_free.pdfIn PDF document text
    • http://5gusevshop.space/refulosok7o68o.pdfIn PDF document text
    • http://experiment.website/169977179240yt52.pdfIn PDF document text
    • http://fotubobuwenapu.scienceontheweb.net/binurakipivoxuse.pdfIn PDF document text
    • http://haifaiv.ru/475525888993rcpp.pdfIn PDF document text
    • http://hangzhoumetal.ru/when_do_we_use_cronbach_alphan4ual.pdfIn PDF document text
    • http://digovin.getenjoyment.net/piwelewuvamebosafexaso.pdfIn PDF document text
    • http://vanlit.ru/674200612361o9xo.pdfIn PDF document text
    • http://3bki.ru/faxatazigut335d3.pdfIn PDF document text
    • http://postel-na-zakaz.ru/bostitch_f28ww_not_firing5axir.pdfIn PDF document text
    • http://immorta-cross1.club/best_rock_ballads_of_the_90so9xv3.pdfIn PDF document text
    • http://freshmind.net/wisasagowofupapobovorjmyst.pdfIn PDF document text
    • http://de-bewertung-889562.icu/zitiligulugobikl9i.pdfIn PDF document text
    • http://roselosudeve.sportsontheweb.net/what_did_the_inventor_of_the_10-ton_truck_so_often_say_worksheet.pdfIn PDF document text
    • http://kupivse.xyz/xivubosunagixaretencxvjl.pdfIn PDF document text
    • http://axecheat6.xyz/35656291234otdoh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bumejefivoxigo.myartsonline.com/depituma.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/bevetani.pdfIn PDF document text
    • https://636e06b3-920c-4898-b827-ef778bbbc101.filesusr.com/ugd/40512e_9e6c6ea2da87461cbd8fe7e0414d5b87.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/75058053269.pdfIn PDF document text
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_3e9c4615f63148e4aaf8dbdf1a34e9e2.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_off0000edfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFB 5412 bytes
SHA-256: cf15a84cb7c1b759581658b9e340875a739eacd2781dae5c3c27bbfb29313940
font_01_sfnt_off0001005f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005F 10356 bytes
SHA-256: 5765bf3dadbdc94cbe31a316be30810ea92d70fb6a067a4e25489090ae2b202d

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