Malicious PDF — malware analysis report

Static analysis result for SHA-256 28d671b6ce84aef6…

MALICIOUS

PDF

75.2 KB Created: 2021-04-03 20:42:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e85e7591f15b0c15c5c6069dfc982f88 SHA-1: caf9e24fc8a6e4f42f7c5dda36fde426b8f328ef SHA-256: 28d671b6ce84aef623e041e8be2da7f89c701e43d443aef4cfd47b0874bb12ba
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many of which point to SEO redirectors and link farms, suggesting a phishing or scam campaign. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics strongly indicate malicious intent. The document body, though heavily obfuscated, contains keywords related to 'John Deere riding mower battery', likely used as a lure to attract victims to click on the malicious links.

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://golowaki.ru/strik?utm_term=john+deere+riding+mower+battery+wont+stay+charged PDF link annotation
    • https://kanemonel.weebly.com/uploads/1/3/5/3/135319287/konunawivoxu.pdfIn PDF document text
    • https://kusazejur.weebly.com/uploads/1/3/1/4/131437880/teledun.pdfIn PDF document text
    • http://dasezin.getenjoyment.net/bidufozukenurapiwi.pdfIn PDF document text
    • http://nebemor.mywebcommunity.org/zofekimotevukut.pdfIn PDF document text
    • https://cdn.sqhk.co/dipasupor/jcgRchj/40302564358.pdfIn PDF document text
    • http://lelekelosutov.getenjoyment.net/postherpetic_neuralgia_adalah.pdfIn PDF document text
    • https://cdn.sqhk.co/vofemolat/gggj1ia/ridujerozigege.pdfIn PDF document text
    • http://libutulidux.medianewsonline.com/13_attributes_of_god_list.pdfIn PDF document text
    • https://cdn.sqhk.co/fubafonu/ZSnRVQN/factory_reset_beats_studio_3_wireless.pdfIn PDF document text
    • https://roserilufelojow.weebly.com/uploads/1/3/1/8/131856860/3475a0af.pdfIn PDF document text
    • http://gikodarekegov.mywebcommunity.org/artisanal_gold_mining.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/fasudikek/liduzapolajuwef.pdfIn PDF document text
    • https://s3.amazonaws.com/kumasala/platform_defence_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/iphone_emulator_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/sokazolevutovekajikiverip.pdfIn PDF document text
    • http://rupijelovugibiz.rf.gd/34493615386.pdfIn PDF document text
    • http://litiwevapebani.epizy.com/25291301843.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_off0000e778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE778 5644 bytes
SHA-256: a0eb59de6438acf4792725ef20c9b655929ca26744ae73fb8218022e800d81d4
font_01_sfnt_off0000fa8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8E 10832 bytes
SHA-256: f80dd3c7a83f912a53c15b755bb670af68dc1a11d7014d51c0b847dc87373df9

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