Malicious PDF — malware analysis report

Static analysis result for SHA-256 f483acac8b1bbfec…

MALICIOUS

PDF

80.3 KB Created: 2021-05-17 11:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 99d186d0a3922be09dd4bb1f0d23a1cd SHA-1: b280baa5b5f6ffe1d902443eb69ad5d813534505 SHA-256: f483acac8b1bbfec8a5f5a559fc7635d56a1f82cb702e41bd3c4845a62d0134b
196 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and lead to redirectors, indicating a link farm or phishing campaign. The primary lure appears to be recipe-related content, but the embedded links, such as https://botokaw.ru/strik?utm_term=veg+sabji+recipes+for+dinner+in+marathi, suggest a malicious intent to redirect users to potentially harmful sites. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://botokaw.ru/strik?utm_term=veg+sabji+recipes+for+dinner+in+marathi PDF link annotation
    • http://firejifanop.iblogger.org/26712283098.pdfIn PDF document text
    • http://tetoxukipim.getenjoyment.net/24907916089.pdfIn PDF document text
    • http://jusegoma.22web.org/daluxozanotonibapebiko.pdfIn PDF document text
    • http://modaxosemerevik.22web.org/active_and_passive_voice_exercises_with_answers_for_class_8_icse.pdfIn PDF document text
    • https://dukikabapesudux.weebly.com/uploads/1/3/4/1/134108868/b9b51b5fc2367d.pdfIn PDF document text
    • http://naturfresh.fun/lame_deer_seeker_of_visions_quotesxj9y5.pdfIn PDF document text
    • http://tikovg.xyz/maze_runner_death_cure_summary81k6p.pdfIn PDF document text
    • http://megalit-korolev.ru/minexirovetuwajobogazax6ak0.pdfIn PDF document text
    • http://tapozifokun.mywebcommunity.org/application_letter_for_scholarship.pdfIn PDF document text
    • http://xibesofene.22web.org/newajazogonir.pdfIn PDF document text
    • https://wemavepudobug.weebly.com/uploads/1/3/4/1/134108610/milonuki.pdfIn PDF document text
    • http://converstarget.ru/ikea_catalogue_2019_canadac6hi7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xokebore/audio_trimmer_software_free.pdfIn PDF document text
    • http://delunax.rf.gd/12341937046.pdfIn PDF document text
    • https://s3.amazonaws.com/dagasopones/93063491239.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/35341473171.pdfIn PDF document text
    • https://s3.amazonaws.com/dusined/43290704076.pdfIn PDF document text
    • https://s3.amazonaws.com/nowonovege/xowotefononodogamegorepan.pdfIn PDF document text
    • https://s3.amazonaws.com/wozowuledij/27890387829.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_off0000faf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF1 5720 bytes
SHA-256: f6bcdd15a3352e7d63686c4627d514523d7ce3de1b425014ff3377119764fa94
font_01_sfnt_off00010e4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4F 11196 bytes
SHA-256: 6d197d130b28f1bcd9670228be91e9ef1525a1c2eb16d2d0c923ce9b3c5b96e6

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