Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf1fec693e24890d…

MALICIOUS

PDF

70.0 KB Created: 2021-04-15 07:44:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 46d6e4d0a0e74ba92855216a2c123d79 SHA-1: d3cdd2a88d78986b3af0aa3cf3ccef22525b52ec SHA-256: bf1fec693e24890d3371c1b769525e83558c8e920292b337cba5699beef06120
156 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 to benign-looking documents, but one prominent URL points to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or a scam. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect the user to malicious content, potentially a phishing page or a download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/strik?utm_term=should+i+major+in+business+or+computer+science
    • https://kegibaxita.weebly.com/uploads/1/3/4/6/134661687/300f9855ac.pdf
    • https://kudizuvawemexol.weebly.com/uploads/1/3/4/3/134307781/tudufalutabujejaseru.pdf
    • https://mudufisapegew.weebly.com/uploads/1/3/6/0/136097401/zuxesage-turaki.pdf
    • http://vetejula.mypressonline.com/german_articles_exercises.pdf
    • http://fevevafo.medianewsonline.com/nunca_foi_sorte_adriana_sant_anna_download.pdf
    • http://goligofalu.medianewsonline.com/80025415998.pdf
    • https://kutikeso.weebly.com/uploads/1/3/4/4/134490414/balepusaponini.pdf
    • http://bikejesoxatelo.mygamesonline.org/worogivumixiv.pdf
    • https://zinibikilejob.weebly.com/uploads/1/3/4/8/134886520/5207437.pdf
    • https://busejutepegojo.weebly.com/uploads/1/3/4/7/134773147/3534177.pdf
    • https://tagojakiwuki.weebly.com/uploads/1/3/4/4/134444274/0c37631b7d4.pdf
    • https://dokakuzod.weebly.com/uploads/1/3/4/8/134884054/92f8942.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jofunozuzof/aisc_moment_connection_design_guide.pdf
    • http://zikoliduxa.atwebpages.com/badomuku.pdf
    • http://bexovivuvere.myartsonline.com/15989735200.pdf
    • https://s3.amazonaws.com/tujeviwakirawu/gafunidebirexizobobakifor.pdf
    • https://s3.amazonaws.com/tevomenil/atem_television_studio_hd_tutorial.pdf
    • https://s3.amazonaws.com/busutafitufe/how_is_the_white_princess_related_to_the_white_queen.pdf
    • http://xunudijumo.myartsonline.com/25126206032.pdf
    • https://s3.amazonaws.com/tapelu/consumer_behavior_eleventh_edition.pdf
    • https://s3.amazonaws.com/mamibis/dabubasewonuzalesofime.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_off0000d407.bin
2f2da7972432d2acfd79e5cf8395ab842dc86f3f2d942b3f51b475c931ff4916		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD407 5632 bytes
font_01_sfnt_off0000e6f6.bin
380beeb753fe0e2fde6012eb8477fca6032a43155fc880eda2fa90fbcece8742		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F6 9840 bytes

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