Malicious PDF — malware analysis report

Static analysis result for SHA-256 a15553744aab6665…

MALICIOUS

PDF

73.7 KB Created: 2021-03-28 04:32:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ef11a799db340bd3417051bad711c89c SHA-1: 21b1ebfe59be75e27f96fecd6b0d8191140cde14 SHA-256: a15553744aab66655852c3a0b6c3c55a205bac748b04dbbfa7290c20f68ad554
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or spamming operation. The primary URL, 'https://xezojetit.ru/123?utm_term=calculate+percentage+increase+google+sheets', is likely part of a phishing or deceptive content delivery scheme.

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://xezojetit.ru/123?utm_term=calculate+percentage+increase+google+sheets PDF link annotation
    • http://kikifikoxije.mypressonline.com/what_is_daybed.pdfIn PDF document text
    • http://tufodudem.mypressonline.com/susujidib.pdfIn PDF document text
    • http://wusozupu.mypressonline.com/66273286320.pdfIn PDF document text
    • https://jejojoroliwe.weebly.com/uploads/1/3/4/3/134310913/2bb4ca63c442.pdfIn PDF document text
    • https://cdn.sqhk.co/vizelupavew/it2QJjg/suruwemixe.pdfIn PDF document text
    • https://sotemukolewidiv.weebly.com/uploads/1/3/4/6/134660154/7777569.pdfIn PDF document text
    • https://lipuriwos.weebly.com/uploads/1/3/5/3/135325722/ziziwofaj.pdfIn PDF document text
    • http://fevevafo.medianewsonline.com/88303956060.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b3709dad-42f4-4621-9b7e-74d31ca978cd.filesusr.com/ugd/f91cf1_4779a03163bd49ffb9a849343613e8b3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c1de70f-4a8b-4cef-af07-aca0798150d4/wilokepudawixupotesibuxek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e65d1eee-0410-40e4-94b7-9cc75e1256e3/valujejekujomafideg.pdfIn PDF document text
    • https://93dbb2ad-f1e8-4c6c-adfd-2ef134399473.filesusr.com/ugd/df4650_395ea4e7dc9345de989fd0be08804478.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/safago/zexoxopanewibukevarivoge.pdfIn PDF document text
    • https://ef91f683-d150-451a-afa2-e6a68a35de23.filesusr.com/ugd/c4f63d_05ec0982fa754063bd5e2d0cf64e6e46.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/35497985418.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fcd9674-e9de-4ced-b9bb-5e7547281ad6/hatchet_book_chapter_17_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/xijilesuzuxo/fedebudumupunuvawij.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C6 5100 bytes
SHA-256: f2828322407b5571c43e9c00a251ef984075b322501a868e8b331bc097859445
font_01_sfnt_off0000f616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF616 10420 bytes
SHA-256: d856d4bf9c206837632c7647ce5537099a3e66e7a055ed5cf94ff2259098eae6

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