Malicious PDF — malware analysis report

Static analysis result for SHA-256 32f5e20555cf81a6…

MALICIOUS

PDF

80.5 KB Created: 2021-03-06 18:07:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: cab24761eab36af84269c518215d26df SHA-1: 87b7bfa7ad4b7b6ed4e69928d7c0aca936e060b5 SHA-256: 32f5e20555cf81a6b7047fdd8dbc9837e9cb6020beb410942ce511b9d8bb94a8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/strik?utm_term=how+to+put+belt+on+old+maytag+dryer PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4412408/normal_5fe268e951436.pdfIn PDF document text
    • http://goloszauniver.fun/xemepevigodadinolapaohpfj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375093/normal_5fe76a1d896c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380090/normal_602b861432c5b.pdfIn PDF document text
    • http://bestita.space/lopisafexosersepb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478670/normal_601923949e4d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473044/normal_5fd1fdafc130c.pdfIn PDF document text
    • http://tojasojula.iblogger.org/free_chrome_browser_for_android.pdfIn PDF document text
    • http://bigno.space/20640816841qk5zk.pdfIn PDF document text
    • http://badgesverified.com/dunk_and_egg_storiesn3d89.pdfIn PDF document text
    • http://bukejasinopa.22web.org/59330174825.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379370/normal_6042cc90971a0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427086/normal_5fe02e7a89906.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379841/normal_603224d15444b.pdfIn PDF document text
    • http://goodnaturak.space/71446459454wkwcr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://povuputuk.epizy.com/titapusifipavuwakek.pdfIn PDF document text
    • https://7f793f8f-877f-420e-851b-8bae9ea62a4d.filesusr.com/ugd/78c764_b332c0408a12499dbbd24d587387b99a.pdf?index=trueIn PDF document text
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_249187c318b34d66a38df3076c0df179.pdf?index=trueIn PDF document text
    • http://zetikof.epizy.com/51135649570.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/243a07d2-cc62-4947-9c8b-d7c0c9c6ecd4/78958958938.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a83c7e6-3935-4eeb-8cce-dcb9e1cf1417/how_to_make_dovetail_joints_with_a_router_jig.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_off0000fc59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC59 5396 bytes
SHA-256: 761b25c31d35d90eae5f88c0a011445ded3a685f047306a226c7ee2c97014ce8
font_01_sfnt_off00010ea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA8 11304 bytes
SHA-256: bc68da62c910cb41326cad50fb529a549d2333e28b3885e9cfbd87696ccf39f7

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