Malicious PDF — malware analysis report

Static analysis result for SHA-256 b03b832b5f6cd735…

MALICIOUS

PDF

84.7 KB Created: 2021-04-07 01:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4122db6ac9e6a6cd8d059d9407599ccb SHA-1: ce4ff055d10ce9b44424f9a8d69c2e9116a00347 SHA-256: b03b832b5f6cd735c20652bbe4cf5e5a1e5068d486b628e1f16a5ac174aef9c4
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating the document's purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://zajinet.ru/strik?utm_term=how+do+i+change+the+wifi+on+my+tp+link+smart+plug PDF link annotation
    • http://brosbass.com/what_words_indicate_cause_and_effect9vlx3.pdfIn PDF document text
    • http://olymp-trade.top/the_size_of_each_exterior_angle_of_a_regular_polygon_is808yt.pdfIn PDF document text
    • http://lenuvivureropi.scienceontheweb.net/hafele_catalog.pdfIn PDF document text
    • https://vumamoxaku.weebly.com/uploads/1/3/1/3/131380777/8049786.pdfIn PDF document text
    • http://calipshatngaccs1.xyz/95402210575lidup.pdfIn PDF document text
    • http://mobufuwiwid.medianewsonline.com/travel_itinerary_example.pdfIn PDF document text
    • http://kelimap.mywebcommunity.org/sokebebu.pdfIn PDF document text
    • http://golixudib.mypressonline.com/63786382209.pdfIn PDF document text
    • http://thestablestl.com/gma_news_reporters_namesgkox8.pdfIn PDF document text
    • https://nolemidu.weebly.com/uploads/1/3/4/5/134584078/1314370.pdfIn PDF document text
    • https://cdn.sqhk.co/revinoxu/ibUjWIC/80319306698.pdfIn PDF document text
    • https://safalijig.weebly.com/uploads/1/3/1/0/131070993/1170479.pdfIn PDF document text
    • https://nalabusapigo.weebly.com/uploads/1/3/2/7/132740218/vetul.pdfIn PDF document text
    • https://kuvuwivozud.weebly.com/uploads/1/3/6/0/136091804/1364902.pdfIn PDF document text
    • https://wisadokuresagor.weebly.com/uploads/1/3/1/4/131436967/kobatafopoma.pdfIn PDF document text
    • https://cdn.sqhk.co/vavetiset/ibGTid3/2478837905.pdfIn PDF document text
    • https://dakubazelup.weebly.com/uploads/1/3/1/4/131454222/d2bb97fcf25c.pdfIn PDF document text
    • https://topigofifudonif.weebly.com/uploads/1/3/5/3/135304546/kipupujub_zogamu.pdfIn PDF document text
    • http://tapodozinojet.mypressonline.com/zijumibibokaxevu.pdfIn PDF document text
    • http://kazotapojiwi.mywebcommunity.org/xodewalene.pdfIn PDF document text
    • http://antileqphh.site/lady_macbeth_essay_questions_and_answersqx6g7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kuxemozoxabonag.onlinewebshop.net/safatifakaj.pdfIn PDF document text
    • http://kagijido.myartsonline.com/94493012032.pdfIn PDF document text
    • http://jelomasulavi.atwebpages.com/acidose_tubulaire_rnale.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_off00010bc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC1 5788 bytes
SHA-256: 1616195e10b055462d9814fc06d78d2e42e31f4d1b8973e34380ff51630eb582
font_01_sfnt_off00011f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F69 11036 bytes
SHA-256: 54bf611b926277b9f58ee48e23e9818d39b1d54f5226ba5e8ed3f2ce328179c0

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