Malicious PDF — malware analysis report

Static analysis result for SHA-256 27dd22f2a3c25917…

MALICIOUS

PDF

79.8 KB Created: 2021-06-15 20:26:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 044d83f65b26e56147f9551603d0c0a9 SHA-1: 0e1e06048f78853cc22de5ddebe74c4e3e0dd22d SHA-256: 27dd22f2a3c25917c089aea01919f6a38bd0b15e2b7036fc598cf44ef317df30
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links pointing to various domains, many of which are hosted on disposable platforms like Weebly and PBworks. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute malicious content. ClamAV and ML classifiers also flagged this file as malicious, supporting the phishing/trojan classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://riwitasaroxaga.weebly.com/uploads/1/3/4/6/134656256/1905853.pdf In PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4464080/normal_60b1bf2d37097.pdfIn PDF document text
    • https://vuzirokisex.weebly.com/uploads/1/3/4/5/134576988/a76bbf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501479/normal_5febb02a4bbb1.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4460231/normal_60b04074c2bca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375088/normal_5fdccad8cbe96.pdfIn PDF document text
    • https://nusomosuguxapo.weebly.com/uploads/1/3/4/6/134693055/9499613.pdfIn PDF document text
    • https://naxutaper.weebly.com/uploads/1/3/7/5/137500597/gasogus.pdfIn PDF document text
    • https://babaperivagam.weebly.com/uploads/1/3/1/3/131379833/wiwari.pdfIn PDF document text
    • https://wejatinolu.weebly.com/uploads/1/3/1/4/131438249/poxirizudozezok-runenaru-ruwifewimad.pdfIn PDF document text
    • https://gujaninarenuwin.weebly.com/uploads/1/3/4/3/134319279/ceed5631ab18b0.pdfIn PDF document text
    • https://xirozakopep.weebly.com/uploads/1/3/4/7/134719339/3398639.pdfIn PDF document text
    • https://kutufexefe.weebly.com/uploads/1/3/4/6/134695169/jazezujajotukarixar.pdfIn PDF document text
    • https://nuruvubapifak.weebly.com/uploads/1/3/1/4/131452890/2334321.pdfIn PDF document text
    • https://kuxubujokug.weebly.com/uploads/1/3/0/7/130775750/fipineg_xulolo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484997/normal_603a81d1c3767.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://feedproxy.google.com/~r/wb/ENAH/~3/bVCGPfG74RQ/wb?keyword=western%20unimount%20plow%20mountPDF link annotation
    • http://xiwesamoneni.pbworks.com/w/file/fetch/144893778/jurassic_world_the_game_hack_version.pdfIn PDF document text
    • http://gutopevif.pbworks.com/w/file/fetch/145296417/a_maritime_polar_air_mass_is.pdfIn PDF document text
    • http://xumefosux.pbworks.com/f/what_is_underdevelopment_in_nigeria.pdfIn PDF document text
    • http://vawijoj.pbworks.com/w/file/fetch/144819636/ori_and_the_blind_forest_change_difficulty.pdfIn PDF document text
    • http://bafakud.pbworks.com/f/55462638787.pdfIn PDF document text
    • http://nibokuwogi.pbworks.com/f/sekujidajikovovirexirise.pdfIn PDF document text
    • http://zeranagaro.pbworks.com/w/file/fetch/144711999/83551858944.pdfIn PDF document text
    • http://sodogugokaf.pbworks.com/w/file/fetch/145312218/dragon_mania_legends_mod_apk_5.0_5c.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_off0000ebc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC7 4740 bytes
SHA-256: 1eedc41b757933d0191816e3adef968102f1254e903ff65decb0c1c02cf9e15d
font_01_sfnt_off0000fbda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDA 11796 bytes
SHA-256: 4ce6c7bcff21fecdd6794b78eca28703ef52c84ff71d4020caba095184855baf
font_02_sfnt_off000123d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D3 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34