Malicious PDF — malware analysis report

Static analysis result for SHA-256 48edbfa4042665e8…

MALICIOUS

PDF

78.6 KB Created: 2021-04-28 09:13:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: a9cb9f63dc37737de97f66d4216155f7 SHA-1: 4843a2e528fb20cadea467641227fc53aee2e763 SHA-256: 48edbfa4042665e8d6c2ef3441b429d22fc9525f4e52db93c63ea10064746e45
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards an attempt to redirect 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://nipisod.ru/strik?utm_term=amplificador+fender+mustang+gt+200 PDF link annotation
    • https://lutatodu.weebly.com/uploads/1/3/4/6/134697406/1230797.pdfIn PDF document text
    • https://xavodumofas.weebly.com/uploads/1/3/4/9/134901052/609e27e203ab15.pdfIn PDF document text
    • https://tusuwijajibu.weebly.com/uploads/1/3/4/5/134517525/e9252aa48e86feb.pdfIn PDF document text
    • https://vanuvinuvur.weebly.com/uploads/1/3/0/9/130969573/9c5e91.pdfIn PDF document text
    • http://mosomupusafebin.medianewsonline.com/dulatafopufefivosawedunu.pdfIn PDF document text
    • https://xetutimi.weebly.com/uploads/1/3/0/9/130968997/6623a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7a7a24f-943f-4ddb-9929-645da612150f/rosemarys_baby_2014_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad54a31e-37c4-450b-aa4d-4bf4680fdb6e/kesusorotarefobodagev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cca28872-527e-41a0-a892-2abda46f1484/peer_support_specialist_interview_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e03fc76-83d9-482f-a6f5-f53797925038/41035996829.pdfIn PDF document text
    • http://xolazituvote.epizy.com/all_baul_song_free.pdfIn PDF document text
    • http://tepokubomime.rf.gd/bukosudukuroluk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/398f05f6-1dee-4e0e-8373-2876cfbce1d1/can_i_do_dbt_on_my_own.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07cb4e52-caf9-4123-af88-20b30cfa9219/how_much_does_a_manager_at_chick_fil_a_make.pdfIn PDF document text
    • http://japinoxizidunub.myartsonline.com/majevixodagixotipurus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f40ca439-b67e-41c1-8545-d355a2537296/wuwat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64d73469-b1a0-4fe7-b396-5a475388d228/3830163836.pdfIn PDF document text
    • http://bibezulanivukis.rf.gd/pipipowamejumi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71edbbc5-8a82-4353-ad27-a5a7aa733795/17_indisputable_laws_of_teamwork_summary.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_off0000ed6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6A 5740 bytes
SHA-256: ce3325af259886a8575f3b711dc7e000f604ed928d1148b9dd87fca32e8e1c8f
font_01_sfnt_off000100e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E0 13812 bytes
SHA-256: d04905a4db30a597e00bd4121a9730883e696d453039b39d33085ac27bbe7adb