Malicious PDF — malware analysis report

Static analysis result for SHA-256 f729c23c9b72ce47…

MALICIOUS

PDF

79.7 KB Created: 2021-03-20 23:29:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 1402b8a322fb8d8626a265e4f804b32b SHA-1: d198b89f227a9a809ed97e8509d886638491fe35 SHA-256: f729c23c9b72ce470a1ffaaf4851b478c6fb0a7ae36d57aa9fce5c204eccd18e
226 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many pointing to disposable domains and potentially malicious content, as indicated by the PDF_SEO_LINK_FARM and PDF_SUSPICIOUS_LINK_LURE heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the nature of the link farm suggests it could be used to host further malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://jacksth.ru/aws?utm_term=animal+farm+movie+1954+netflix PDF link annotation
    • https://nudabubi.weebly.com/uploads/1/3/4/3/134323665/2d4c476cd2c.pdfIn PDF document text
    • http://kufafukedexepix.mygamesonline.org/bobbi_brown_makeup_brushes_kit_price.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxiropuwomo/W2Phiat/65936634995.pdfIn PDF document text
    • https://cdn.sqhk.co/resasenubori/5UBjjhc/parkour_go_2_unblocked.pdfIn PDF document text
    • https://nizifaweneli.weebly.com/uploads/1/3/4/5/134589853/fogotamejokodel.pdfIn PDF document text
    • http://fb-ig-copyright.com/hp_laserjet_p2055_specificationsttha6.pdfIn PDF document text
    • https://cdn.sqhk.co/relulapezele/bt5xIib/23367109456.pdfIn PDF document text
    • https://cdn.sqhk.co/goxobuve/hjhehfG/57838152093.pdfIn PDF document text
    • http://managerprogram.live/cvc_words_freeyqhkk.pdfIn PDF document text
    • http://mscgis.net/mudapojofowomaklyaoh.pdfIn PDF document text
    • http://vatidenow.medianewsonline.com/boluk.pdfIn PDF document text
    • http://jewlgems.com/82931231134bq3i2.pdfIn PDF document text
    • http://navalny.design/abc_songs_freezbx88.pdfIn PDF document text
    • http://befigter.xyz/27051405350ugqgq.pdfIn PDF document text
    • http://mp4.design/dasedi9sdvp.pdfIn PDF document text
    • http://italy50wow.pro/nozonawapebn9in7.pdfIn PDF document text
    • http://tafugegajotu.mygamesonline.org/furuno_navnet_vx2_service_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/ludukuni/ig4NhbN/color_balls_unblocked.pdfIn PDF document text
    • http://bred-enligne.com/cartoon_comedy_tinyjuke4neyg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tupesom.atwebpages.com/togonekamofegozer.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_off0000fb8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8B 5272 bytes
SHA-256: ea2c3bdef2bf144bc6f4f64e11312cacd7a7d0655fe7029833ff14249000237e
font_01_sfnt_off00010d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7F 10740 bytes
SHA-256: 583c94c76a66a7486bd5a71abf79f352f1fe4411fafe2265c521bf7f9f67ab41

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