Malicious PDF — malware analysis report

Static analysis result for SHA-256 23a6998b60ac721d…

MALICIOUS

PDF

75.9 KB Created: 2021-03-02 08:01:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 83f4783f0bdc4dd8c38c5e58d1a7fee7 SHA-1: a0fff5326ceceb5430ae5ecf2db5b30372a80590 SHA-256: 23a6998b60ac721d1812e26c899bf5f216bf65fa581228e8f1d678a07177ebb9
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The presence of a specific search query in one of the URLs indicates a potential phishing or scam lure. ClamAV and ML classifiers also flagged this PDF as malicious, likely due to its structure and embedded content.

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.
  • 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://kuzutuzo.ru/123?utm_term=double+down+kfc+price+mauritius PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368758/normal_601ee0647928d.pdfIn PDF document text
    • https://cdn.sqhk.co/jawubibegeba/hec3hhU/word_connect_level_1514.pdfIn PDF document text
    • https://cdn.sqhk.co/zajujinul/chhgjNM/bilinulaburijonebuj.pdfIn PDF document text
    • http://towufato.mywebcommunity.org/sunbeam_electric_blanket_blinking_f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486350/normal_5feba448e424d.pdfIn PDF document text
    • https://cdn.sqhk.co/kizofapekeku/pJDIicZ/gem_event_idle_heroes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480898/normal_5ffc872a40ef3.pdfIn PDF document text
    • https://cdn.sqhk.co/duponetix/hjejgYC/82577236869.pdfIn PDF document text
    • https://xosofanukofupa.weebly.com/uploads/1/3/4/8/134879033/zabapilukopedoj.pdfIn PDF document text
    • https://cdn.sqhk.co/xakurusuk/v9gchcH/lefavimufezafumofinunu.pdfIn PDF document text
    • https://xozejobe.weebly.com/uploads/1/3/1/4/131406614/9562976.pdfIn PDF document text
    • https://cdn.sqhk.co/matajikiwov/jdfw2zf/bebowizawukarot.pdfIn PDF document text
    • https://kudiwugeditonaf.weebly.com/uploads/1/3/5/9/135964520/2512108.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467571/normal_5fdad24456b22.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/fivebo/48440854016.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/beats_by_dre_solo_3_on-ear_wireless_headphones_-_rose_gold_review.pdfIn PDF document text
    • https://s3.amazonaws.com/nabifovu/gabeteren.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/naxiboguvezur.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/xegugunemuxup.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_off0000e63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63F 5596 bytes
SHA-256: 4706be52d005d49553e920a76fcb2fdb2261f98dab82206621c48e6cff92e75f
font_01_sfnt_off0000f943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF943 12380 bytes
SHA-256: 91d9b12777409543c21be2dad7e5ff4ef0deec67dbc453b62a6e4c4cd211fe62

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