Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ff5808309af1791…

MALICIOUS

PDF

75.7 KB Created: 2021-03-25 03:47:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 86b922a58d745a210e7ac915d062965e SHA-1: d2bb0dc1b9a0ad59dc3fd94e565cf04e7747f439 SHA-256: 6ff5808309af1791ff4ee14b58d28fe2fac7182e6911b3f0d0f9a1659bfb9720
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, indicative of a link farm designed to attract traffic. The presence of URLs like 'resalured.ru/wix?keyword=samsung+imei+repair+tool+free+download' suggests a lure to download software. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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://resalured.ru/wix?keyword=samsung+imei+repair+tool+free+download PDF link annotation
    • http://xuwuvewisin.mypressonline.com/28151814832.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450519/normal_602c0bd9c549c.pdfIn PDF document text
    • https://kafolegilu.weebly.com/uploads/1/3/2/3/132303068/tipajusar.pdfIn PDF document text
    • http://juponuziwotaga.mywebcommunity.org/funny_books_for_8_year_olds.pdfIn PDF document text
    • http://vonexalux.sportsontheweb.net/marese.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375702/normal_603683e9406ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369506/normal_5fe6c91b26a3d.pdfIn PDF document text
    • https://rexerobebaru.weebly.com/uploads/1/3/1/8/131872155/ac67f5ca71e9.pdfIn PDF document text
    • https://zokolukesowi.weebly.com/uploads/1/3/0/7/130776120/bede9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450036/normal_60288d507bb80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366034/normal_5fd2d4efee498.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://db7841a4-af10-4990-a2be-f084cd4acbf6.filesusr.com/ugd/e3c460_75368421b0ce4d38a73afeb04e7ddc3a.pdf?index=trueIn PDF document text
    • http://pojoviraxerojo.myartsonline.com/the_art_book_big_ideas_simply_explained.pdfIn PDF document text
    • https://13a7c488-548c-4b48-b567-d2b0b9a3e1de.filesusr.com/ugd/85d67f_ef82eb776dd64f7487c11afbb5f81106.pdf?index=trueIn PDF document text
    • http://livirava.atwebpages.com/23717085026.pdfIn PDF document text
    • https://a6f18165-9bfd-46c9-8f51-0ab50cd0b687.filesusr.com/ugd/265c7a_988fc469c14d4534b01f22011507edb2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kukazowox/3150346738.pdfIn PDF document text
    • https://s3.amazonaws.com/fukezavazuj/proper_way_to_clean_a_george_foreman_grill.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/palofuluwugibotomiwuzamit.pdfIn PDF document text
    • https://459fb65c-52af-4c88-885a-43a44fbeaf25.filesusr.com/ugd/6a7407_6d6f1126eb714aa5846e838c81774461.pdf?index=trueIn PDF document text
    • https://75e6061f-eb7a-4ce8-b546-077bf96366c3.filesusr.com/ugd/2dfd19_487baab7157e4332a710acb35e3cd93a.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_off0000e935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE935 5556 bytes
SHA-256: a4f445dea73d7c29f039be23bc232977049a37d6fe879a1b4359b71b2703c1ee
font_01_sfnt_off0000fc12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC12 10944 bytes
SHA-256: 5a25ba54d8d133f7d7adb3aff06ce272f5fef23695f7ce85e27a94a555ec75cf