Malicious PDF — malware analysis report

Static analysis result for SHA-256 51b6fefa106bc653…

MALICIOUS

PDF

78.8 KB Created: 2021-02-18 09:49:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9a9caadc6a7bfefac4a40a0d9980964c SHA-1: d2087520ea133a1750e43e05b54388773d07f5e3 SHA-256: 51b6fefa106bc653ff1b878d21e6797f955a11b180f993d42bd98fb37ca22f04
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely part of a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://baarspo.ru/strik?utm_term=how+do+you+clean+a+char+broil+big+easy PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452386/normal_6015328e33694.pdfIn PDF document text
    • http://parkji5x.xyz/lixegemikewosznsr.pdfIn PDF document text
    • http://rexuxudal.22web.org/nujawipamarafenokon.pdfIn PDF document text
    • http://akillidestekbasvuruformu.online/182566493179lf0f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374021/normal_5fca69c107a09.pdfIn PDF document text
    • https://litodamun.weebly.com/uploads/1/3/4/7/134710511/kivuturov_zilerare.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495385/normal_5fcb6b476cefe.pdfIn PDF document text
    • http://osmosiotzs.fun/rakiwuzubenesezigqj.pdfIn PDF document text
    • http://italiahot.space/estimulacion_cognitivaeswhp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478146/normal_600f3ee7b9236.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424010/normal_600dd00472fec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416672/normal_600213aa6fab7.pdfIn PDF document text
    • http://accface.in/king_herod_jesus_christ_superstar_alice_coopersc2g3.pdfIn PDF document text
    • http://alteramaks.world/diary_of_a_wimpy_kid_meltdown340ql.pdfIn PDF document text
    • http://vinnipoh.space/pudefawujaxgjana.pdfIn PDF document text
    • http://prizinsta24.site/nerzugal27s_extended_bestiary_the_trove80fip.pdfIn PDF document text
    • https://dulumomotuvubu.weebly.com/uploads/1/3/4/7/134759228/c9c1bf.pdfIn PDF document text
    • https://lomofoxagut.weebly.com/uploads/1/3/4/5/134524577/dobadifarodapiloxomi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404984/normal_5fc6bdf6ac716.pdfIn PDF document text
    • https://nobakavukip.weebly.com/uploads/1/3/4/3/134373074/5240642.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403805/normal_5fc74f375b692.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dudakesiburegig.rf.gd/wejagofodorubenekanen.pdfIn PDF document text
    • http://rivelik.epizy.com/kavipalorag.pdfIn PDF document text
    • http://xuresiru.epizy.com/poziropawanazokixiwove.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_off0000f5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CE 5496 bytes
SHA-256: d6ac6ab0af7a09ef454b86255d2d30933205103ec251024dd3b820e7c58ea026
font_01_sfnt_off00010889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10889 10912 bytes
SHA-256: 1c3a38c8586ec8ed4a98ce3a0a509164dfa7ab87aa2e958088c52fdb5363a80d

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