Malicious PDF — malware analysis report

Static analysis result for SHA-256 9781665bfff4d4f1…

MALICIOUS

PDF

88.4 KB Created: 2021-04-22 22:40:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b4fd935de64684bf45704f2103f273ce SHA-1: c213b4c297f63eeffc2324704afe36836f4670a0 SHA-256: 9781665bfff4d4f12b6941b7ee82f34dfdf2eb9d32089dcb3d654f4e83a8fee4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous external URLs, with one prominent URL pointing to a potentially malicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://botokaw.ru/strik?utm_term=how+to+make+perfect+mortise+and+tenon+joints PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4427793/normal_6005576fc472b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416302/normal_602c7b2d1fc9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389571/normal_6066c447bf3aa.pdfIn PDF document text
    • http://kigaruzolalo.mypressonline.com/biwater_gauff_v_tanzania.pdfIn PDF document text
    • http://dontbeshy.xyz/80s_techno_musictqwj4.pdfIn PDF document text
    • http://petersikdar.com/what_does_a_caliper_look_like_on_a_cara0x5w.pdfIn PDF document text
    • http://fijexojor.getenjoyment.net/little_nation_and_other_stories_audiobook.pdfIn PDF document text
    • http://fabermanufacture.ru/what_year_did_class_of_2015_start_high_school04n42.pdfIn PDF document text
    • http://toteganutiv.66ghz.com/xofevibel.pdfIn PDF document text
    • http://gugolufixa.mywebcommunity.org/my_body_belongs_to_me_coloring_book.pdfIn PDF document text
    • http://ccckkkkk.space/127674863401m6o1.pdfIn PDF document text
    • http://copyright-infringement.business/castaway_cove_waterpark_pricesjk9fq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384318/normal_6026d5282017c.pdfIn PDF document text
    • http://sekelenogake.getenjoyment.net/8._2_graphing_more_complicated_rational_functions.pdfIn PDF document text
    • http://milanbeachs.space/sinovuwebuvizalefaf24th9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378386/normal_6044fe2e07aad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kuzemepusiloj.onlinewebshop.net/47182832349.pdfIn PDF document text
    • https://964beff5-d24f-450a-94e2-fa7e9faef44a.filesusr.com/ugd/61158f_f1a29deaa95142b691cef4be889ec499.pdf?index=trueIn PDF document text
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_649faefb5e9a4c22b59bb6254ba3e9c2.pdf?index=trueIn PDF document text
    • http://koriguno.rf.gd/merezomup.pdfIn PDF document text
    • http://rovujanoro.epizy.com/josuminivanulo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010dfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFD 5248 bytes
SHA-256: d232e28ed2d4b99319c5af75557fb7d705fa9ee3e0d409176bd3a8d3879a58a2
font_01_sfnt_off00011fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCD 11028 bytes
SHA-256: 0c8a01120dbb45ef14fd953e3081f8d672a6c0f2e21ec605ccf1038a4b8d2908
font_02_sfnt_off0001456a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1456A 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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