Malicious PDF — malware analysis report

Static analysis result for SHA-256 0589f5df246ca195…

MALICIOUS

PDF

70.8 KB Created: 2021-02-13 11:59:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 4da2b6773de199c8e250843863ab42f9 SHA-1: dea0ec9a845cc63c2e1ac913b147258c69f45a3a SHA-256: 0589f5df246ca1959a2b76123ca126967732dffda7e234fa05fb6f2390b4fb2c
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm used for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and the presence of external links are indicative of techniques used to lure users to malicious sites.

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://jacksth.ru/123?utm_term=gramos+a+mililitros+cocina PDF link annotation
    • https://cdn.sqhk.co/zidodovare/hhjhJij/dragon_simulator_attack_3d_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455907/normal_5ff5feb4becca.pdfIn PDF document text
    • http://gulebamabixaku.22web.org/bahubali_songs_mp4.pdfIn PDF document text
    • https://rokopopowatapo.weebly.com/uploads/1/3/0/9/130969888/7265891.pdfIn PDF document text
    • https://dopakujovifoba.weebly.com/uploads/1/3/0/7/130739833/e1b24ab1784.pdfIn PDF document text
    • https://nenovalo.weebly.com/uploads/1/3/2/7/132712003/4105318.pdfIn PDF document text
    • https://fonekukiko.weebly.com/uploads/1/3/5/3/135393218/resesazugev.pdfIn PDF document text
    • https://lapawiniposa.weebly.com/uploads/1/3/5/3/135323982/jefodazos-bekebaxawabo-totewuwagapab-xugiwujawamuxu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448116/normal_5fcbed62e65a2.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/zuguvoxoki/furepafeniwup.pdfIn PDF document text
    • http://gonidiwofove.epizy.com/graphene_band_structure.pdfIn PDF document text
    • http://vujomigokije.rf.gd/jowotudej.pdfIn PDF document text
    • http://tefinavi.epizy.com/ruzaporibanibimefami.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/additional_mathematics_spm_2018_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/cvc_word_family_worksheets.pdfIn PDF document text
    • http://dilalixurapa.epizy.com/ngo_internship_report_ppt.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_off0000d745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD745 4976 bytes
SHA-256: 09f79fd6bfa8ebcc945a82591c1bf016a6a3c42cb315692bbdf22e87f95bf17b
font_01_sfnt_off0000e819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE819 11704 bytes
SHA-256: 043c97aa82b3523d5bc56acb2c3d9655b477a52da9bb1c4b44560ec41e87531f

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