Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe2220987635ddc0…

MALICIOUS

PDF

74.8 KB Created: 2021-05-26 16:35:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: da17771f44153a44aed4b1add1be77ca SHA-1: 20837f3740a2cb9b59672700c8e63b656dda6652 SHA-256: fe2220987635ddc06b11c2089f3d045b8aa24a8db62c1dc7dcbfd2998cda3800
126 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a link farm, containing numerous external links, with one specifically identified as a redirector. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the presence of embedded URLs and the link farm structure suggest an attempt to redirect users to potentially malicious sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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=deliha+full+izle+1+b%25C3%25B6l%25C3%25BCm PDF link annotation
    • https://ruzizoradum.weebly.com/uploads/1/3/4/3/134317959/suretis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468828/normal_6057fd083d5df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443610/normal_6035f96f8960b.pdfIn PDF document text
    • https://dotowukigirer.weebly.com/uploads/1/3/1/1/131163902/2883291.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413465/normal_5fdaecd104cf8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381081/normal_6032c1b30e304.pdfIn PDF document text
    • https://mogeletonedilo.weebly.com/uploads/1/3/1/4/131482944/4380376.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388407/normal_5fddc09a5dea9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402737/normal_6037f13b163fc.pdfIn PDF document text
    • https://woluxubofij.weebly.com/uploads/1/3/1/3/131383763/senuzemepiped.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419654/normal_60305c185882c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496389/normal_60226864f36ff.pdfIn PDF document text
    • https://sibikobibe.weebly.com/uploads/1/3/4/0/134040949/letoves_laxafovodug_fizejunusew_zefopigevepaxat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503692/normal_604907042b183.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/855506d7-4c88-46f2-9b67-a1c2f364f7f6/what_are_the_3_theories_of_plate_tectonics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/729f7f40-047c-41ac-a13e-d2319fcd6c82/sony_xbr-55x850b_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0e80030-ce1d-4b0c-822f-adcf59a3fd31/wanakarekeseluboletopab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f24c6e6-34b7-414c-9db9-3ab0a645d213/ravpower_charger_red_light.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c5ad3dc-c57b-4d66-9f6d-a8613c9c933d/fukekagotisi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bd0bb64-31f8-4630-a195-0af9532c81af/jubarasasuzal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9068ba56-e92c-4547-82e9-b43bd7f9a39d/someone_like_you_chords_piano_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec66dcc2-a5b1-4bf3-b3d1-8704d4681fb5/33765792367.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca43b3b4-fe5e-473a-bef5-0c524f563638/vefave.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ad6e70c-1e8a-492d-acc9-e07cfb01cdc1/dibuwabekuvase.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_off0000e56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56A 5232 bytes
SHA-256: 0b2f1cf4bd1b303e5c6298919284944dcd7d3b27b6c0ed0fecc34d693f8d4f97
font_01_sfnt_off0000f6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AC 11932 bytes
SHA-256: 65f724579639d808e43a4b6bd5f3e6d30b32cf1c09085ffe9a539e79cd26d3bc