Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c05dcc839b97431…

MALICIOUS

PDF

79.0 KB Created: 2021-05-14 10:17:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 5c5ad0e8654acb687fad1e4f1abd2534 SHA-1: 883a027442391616a89ab91deadcaa3528d4ba05 SHA-256: 0c05dcc839b974314028b323fba812e1a87308c38faa06603ebfea761c407d22
186 Risk Score

Malware Insights

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

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The embedded URLs, such as 'https://fokemale.ru/strik?utm_term=how+to+get+elderly+parents+to+exercise', are likely used to redirect users to malicious sites.

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://fokemale.ru/strik?utm_term=how+to+get+elderly+parents+to+exercise PDF link annotation
    • https://rixevabibevata.weebly.com/uploads/1/3/2/7/132710753/liwotaged.pdfIn PDF document text
    • http://teren.fun/textbook_of_assisted_reproductive_techniquesf5wl8.pdfIn PDF document text
    • http://azorocheat1.xyz/marriage_vedic_astrology7fyvj.pdfIn PDF document text
    • https://gevexivojuler.weebly.com/uploads/1/3/4/4/134444242/1718166.pdfIn PDF document text
    • http://sallles.ru/how_to_set_armitron_pro_sport_watch_wr330ft4o1u3.pdfIn PDF document text
    • https://zosupexaduj.weebly.com/uploads/1/3/0/7/130738593/9782984.pdfIn PDF document text
    • https://nusepetuvake.weebly.com/uploads/1/3/3/9/133997573/534397.pdfIn PDF document text
    • https://reravojune.weebly.com/uploads/1/3/1/4/131406269/jumikigut_zuzujij_tiwag_zasutemerasep.pdfIn PDF document text
    • https://weligolujevis.weebly.com/uploads/1/3/4/7/134748453/3760284.pdfIn PDF document text
    • https://mabatuba.weebly.com/uploads/1/3/5/3/135303696/9709465.pdfIn PDF document text
    • https://falijufik.weebly.com/uploads/1/3/5/3/135349852/d46cbd109b579.pdfIn PDF document text
    • https://xaxepilote.weebly.com/uploads/1/3/4/2/134265473/rubowubugobameni.pdfIn PDF document text
    • http://beautysale.site/is_zte_banned_in_the_usf4em2.pdfIn PDF document text
    • https://vexokefiveve.weebly.com/uploads/1/3/4/4/134494279/f16a6.pdfIn PDF document text
    • https://sifudalumavobu.weebly.com/uploads/1/3/2/3/132302711/suzajawiwuxater.pdfIn PDF document text
    • https://zujituxo.weebly.com/uploads/1/3/2/6/132681889/guvibisewel_sagopokonilepu.pdfIn PDF document text
    • https://befadileniralan.weebly.com/uploads/1/3/6/0/136082268/9013898.pdfIn PDF document text
    • https://ruvatekokero.weebly.com/uploads/1/3/1/4/131437102/5062721.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e46eb8ae-11b5-47af-91b5-79e2db369635.filesusr.com/ugd/f84671_1cb95c8d9458490787f04e607c74b7b3.pdf?index=trueIn PDF document text
    • https://55afd15b-9a96-48ff-beb6-d705f4765584.filesusr.com/ugd/8b06a9_1da18f6b25d44a60a9b713580439e5ac.pdf?index=trueIn PDF document text
    • https://746420f6-3007-491b-ba72-fd43be5094e5.filesusr.com/ugd/277b62_6983608448a143c3b23f298f1fff7590.pdf?index=trueIn PDF document text
    • https://f55c6975-0091-4942-a106-dc80285e5f9d.filesusr.com/ugd/8a4248_013c32fb4bd94dc59872cfd5c357e560.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_off0000f805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF805 5464 bytes
SHA-256: 0cc75a5946fb1d37acf2253f4809cf68484e89973bf5b26f9ae2133f155efcd1
font_01_sfnt_off00010ac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC7 10520 bytes
SHA-256: 7bacb7b83a9ebbd2f89f48e9727ba98e81da6d6246e488bfa55d1de25108f621