Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f543d64e6647b7d…

MALICIOUS

PDF

66.9 KB Created: 2021-03-29 01:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4b53d73bc523cf03532f2338d98608f2 SHA-1: 201dbe5c97d509b1d436584fc1c00a84ae683229 SHA-256: 8f543d64e6647b7d980d5f49c5ebcf09556106312a1158c40c7432e6aa7b580d
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to SEO-optimized redirectors. The document body, though heavily obfuscated, suggests a lure related to a "Taurus 2 ring saw manual". The presence of multiple external URIs and the ML classifier's high confidence score indicate a malicious intent, likely to drive traffic to malicious sites or engage in phishing.

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://jacksth.ru/wix?keyword=taurus+2+ring+saw+manual PDF link annotation
    • https://wosowabo.weebly.com/uploads/1/3/4/3/134340570/fabikivuvezuxox.pdfIn PDF document text
    • https://jerisiliv.weebly.com/uploads/1/3/5/3/135314768/64977142d3f98e.pdfIn PDF document text
    • https://bapadiwifujeki.weebly.com/uploads/1/3/4/0/134041393/fd659272717.pdfIn PDF document text
    • https://jupojunidukeze.weebly.com/uploads/1/3/4/0/134012404/f34b9d4fc.pdfIn PDF document text
    • http://vigikigopaloze.medianewsonline.com/97582523493.pdfIn PDF document text
    • https://laxonetamaj.weebly.com/uploads/1/3/4/0/134096763/5999078.pdfIn PDF document text
    • https://lotopunukulel.weebly.com/uploads/1/3/4/4/134473418/70621eb4ca.pdfIn PDF document text
    • https://sobexezawatu.weebly.com/uploads/1/3/4/9/134903145/5537168.pdfIn PDF document text
    • https://totorososine.weebly.com/uploads/1/3/4/8/134892144/4decce13491d7.pdfIn PDF document text
    • https://vasuwogi.weebly.com/uploads/1/3/4/0/134017955/rogewa.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/jupoti/medicare_guidelines_florida.pdfIn PDF document text
    • http://gipebevu.atwebpages.com/kafado.pdfIn PDF document text
    • https://s3.amazonaws.com/zabevog/what_is_the_difference_between_space_and_form.pdfIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/9980079132.pdfIn PDF document text
    • http://kozogasivufi.myartsonline.com/casio_gzone_ravine_2_4g.pdfIn PDF document text
    • http://sutexuvidag.myartsonline.com/evs_project_on_water_pollution_in_marathi.pdfIn PDF document text
    • https://s3.amazonaws.com/padadutiseni/toloxelenul.pdfIn PDF document text
    • https://s3.amazonaws.com/zafirawit/9241425538.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_off0000cb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3C 5180 bytes
SHA-256: f5a6570002313afd56f9ebc0d81351a1b5362659264f58e5e9564d2ed8738453
font_01_sfnt_off0000dcd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD4 9856 bytes
SHA-256: a90e83b3520cfb7730786f1286e5d39023b988086bbca49e9bdf855209c4075c

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