Malicious PDF — malware analysis report

Static analysis result for SHA-256 870e8110888025ad…

MALICIOUS

PDF

75.8 KB Created: 2021-03-14 16:46:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 55372be6e3f21e0602eef9fad5d62d94 SHA-1: 3a10cb950d61feb182120a3675a1dfdd72f39bb3 SHA-256: 870e8110888025adf7824b212c87af743ab87eefde6b696405e1956e85d527cf
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML and ClamAV, as malicious and phishing-related. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to search queries, likely intended to trick users into clicking on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=best+knot+for+pulling+a+tree+over PDF link annotation
    • http://klyshsheff.xyz/mirovisulugazetenomolevw0kh.pdfIn PDF document text
    • http://bewilotaweje.mywebcommunity.org/56395734531.pdfIn PDF document text
    • http://sowipilarow.mygamesonline.org/17953190450.pdfIn PDF document text
    • http://ziwigosopijulal.mygamesonline.org/how_to_replace_tecumseh_carburetor.pdfIn PDF document text
    • http://benilobodereji.mygamesonline.org/antifibrinolytic_drugs.pdfIn PDF document text
    • http://tevfikyuce.xyz/canon_mp240_driver_windows_10eflsq.pdfIn PDF document text
    • http://4bochki.ru/mumupimebozunojebixe82n2w.pdfIn PDF document text
    • http://dabopoxele.getenjoyment.net/54506731533.pdfIn PDF document text
    • http://titanovyi-filtr.ru/24772025068x2fpx.pdfIn PDF document text
    • http://remont-pc.website/418622643748iui4.pdfIn PDF document text
    • http://xetorobexojukas.22web.org/53500284411.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/gimufesajo/line_6_ux2_install_on_mac.pdfIn PDF document text
    • http://kodupir.epizy.com/kannada_ambedkar_photos.pdfIn PDF document text
    • http://kesotufujurox.rf.gd/axel_johansson_the_river.pdfIn PDF document text
    • https://s3.amazonaws.com/xijilesuzuxo/what_does_a_godchild_mean.pdfIn PDF document text
    • https://s3.amazonaws.com/dopugaxelelema/kogexexawememoroxi.pdfIn PDF document text
    • http://rivelik.epizy.com/momibo.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/rune_factory_4_leon_marriage_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/dewofo.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/32923731751.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_off0000e9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BF 5240 bytes
SHA-256: 55729cde1795ee8615c13e40b98ebc3e4d654d19bdef3f8a2ff56b0adbdee3fd
font_01_sfnt_off0000fbb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB6 10792 bytes
SHA-256: c98a05243670483b8d610f114e91ebf8dd98c6772e75b535e7ce9531444aa48e

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