Malicious PDF — malware analysis report

Static analysis result for SHA-256 f35570fee1322ecf…

MALICIOUS

PDF

71.2 KB Created: 2021-02-28 05:41:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9527c3f95d5a5dc24e85a226e0672dfe SHA-1: 72bc680af3626c19ba62d280d31e7881d1ca4318 SHA-256: f35570fee1322ecf209be1fd036d0b0d585cc5e1a1243ba7b0fff4a7232f2b27
126 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain ('ponafet.ru') that is likely used to host a malicious payload or phishing page. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a deliberate attempt to obscure malicious links within a large number of disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://ponafet.ru/strik?utm_term=cva+wolf+nitride+with+scope
    • http://zerkalo-fugicar.website/letra_y_acordes_haz_llover_renovadosqevp8.pdf
    • http://santaparker.store/pronunciation_guide_international_phonetic_alphabetayzo0.pdf
    • http://solapp.xyz/502348898546efax.pdf
    • http://xomaweluk.22web.org/is_book_of_enoch_in_the_catholic_bible.pdf
    • http://ighelpcenter.xyz/rca_rt2781hb_remote_controla6nej.pdf
    • http://golixudib.mypressonline.com/how_much_do_you_pay_interior_designers.pdf
    • http://rugegav.mywebcommunity.org/what_is_meant_by_digital_communication.pdf
    • http://dilawiputonu.mypressonline.com/philips_norelco_replacement_smartclean_for_series_9000_shaver.pdf
    • http://tezuveripoxub.mypressonline.com/kafuvomuwomegemikuxebi.pdf
    • http://ruvogodozipabiv.scienceontheweb.net/53956873387.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xiteberukebeki.epizy.com/77950860157.pdf
    • https://s3.amazonaws.com/latufenaw/gijefazijifumewona.pdf
    • http://dibirat.rf.gd/first_book_of_ansi_c.pdf
    • http://zivakafipudejiw.epizy.com/nice_clinical_guideline_atopic_dermatitis.pdf
    • http://ligoroxenafof.atwebpages.com/kusuneni.pdf
    • http://pikuvideposem.epizy.com/1483813600.pdf
    • https://s3.amazonaws.com/gumagabu/11857025918.pdf
    • https://s3.amazonaws.com/mejados/lilewikodiwujusokep.pdf
    • http://wevuwewi.epizy.com/how_to_recall_your_memory.pdf
    • https://s3.amazonaws.com/tobaziw/76909931696.pdf
    • http://kivozusemu.atwebpages.com/68959002725.pdf
    • http://xekazaz.myartsonline.com/67927450852.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d69f.bin
9a2c57ddb09331bba44cc9429440c9c808c2ef5f8d829538d0d5fc06cf655ae2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD69F 5300 bytes
font_01_sfnt_off0000e8be.bin
26960ebae518e2a6e28ababcde23e02fa747841cd261f1bac38e4a37292a8238		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BE 11432 bytes

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