Malicious PDF — malware analysis report

Static analysis result for SHA-256 4430118df34d7f69…

MALICIOUS

PDF

72.4 KB Created: 2021-03-23 03:17:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: ec7927f725867e54a89b44e554bd20d1 SHA-1: b4dade08b537bced14b8dae3246ff8a69d6fc12f SHA-256: 4430118df34d7f695c439152aef21e61b5fda1f2efa982f25cc0ca19790a7b11
186 Risk Score

Malware Insights

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

The PDF document was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external links, many hosted on disposable domains, suggesting an attempt to manipulate search engine results or direct users to potentially malicious content. The presence of embedded URLs and the PDF structure strongly indicate a phishing or SEO spam attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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/wix?keyword=hector%2527s+barber+shop PDF link annotation
    • http://labifovejes.mypressonline.com/92541028776.pdfIn PDF document text
    • http://unityfree.xyz/cooking_with_herbs_and_spicesqvk68.pdfIn PDF document text
    • http://koprovk.xyz/the_choice_2020_watch_onlineqc209.pdfIn PDF document text
    • http://xivekoto.medianewsonline.com/aprender_a_dibujar_aves.pdfIn PDF document text
    • http://gta-msk.ru/best_bp_monitor_for_large_armso8qjw.pdfIn PDF document text
    • http://card2card-perevod24.site/81653132501comkd.pdfIn PDF document text
    • http://topsalon.xyz/dungeon_and_dragons_dice_roller9bmo8.pdfIn PDF document text
    • http://trixy-matrix.space/csgo_config_einfgene08p0.pdfIn PDF document text
    • http://luchdobro.site/xuzifofuz8qinv.pdfIn PDF document text
    • http://ridunculus.com/ruxibulomaxebaf0zj3v.pdfIn PDF document text
    • https://fegalovawi.weebly.com/uploads/1/3/4/3/134349911/fabiputar-vulakabigi.pdfIn PDF document text
    • http://bikuribowe.22web.org/wikofeninuvofojoxe.pdfIn PDF document text
    • http://feziweninepiv.iblogger.org/bidorbuy_app_for_android.pdfIn PDF document text
    • https://fubareno.weebly.com/uploads/1/3/1/4/131482864/zokazoge-nujegebu.pdfIn PDF document text
    • https://lufowatevumidoj.weebly.com/uploads/1/3/4/7/134704320/xusugutebakup_zawop_migasos_tibawupuvil.pdfIn PDF document text
    • https://bigorofepomibed.weebly.com/uploads/1/3/4/4/134400252/falotijabibetetop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kojuvurapamox.myartsonline.com/83322403492.pdfIn PDF document text
    • http://gubunetoz.rf.gd/rudatagukomisasokivuda.pdfIn PDF document text
    • https://033f1a72-e514-447f-b44b-9d234b37386c.filesusr.com/ugd/f05202_379f33be0c2d4f7386876cfe04a86f7f.pdf?index=trueIn PDF document text
    • http://tuwawolaninezon.epizy.com/79200273737.pdfIn PDF document text
    • https://95049c82-e412-4913-a0b0-e03e83d5170a.filesusr.com/ugd/127d6e_024be46be7b143fc89cabcfb62097bfc.pdf?index=trueIn PDF document text
    • https://8ab1a2d5-e5b1-44c5-a28c-e09959565f0d.filesusr.com/ugd/eb712c_ba26b05899834224a8c083ac046f46f3.pdf?index=trueIn PDF document text
    • http://tuwidapaj.epizy.com/36509631359.pdfIn PDF document text
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_7ee04145f15a43b796b3b693441683c1.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD289 5124 bytes
SHA-256: 546b149d8357a145ecd376feb4348fb62e0e60816822548950b578c086b417b2
font_01_sfnt_off0000e3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E7 4560 bytes
SHA-256: 44590a3e449c2e755078e4dc8ce041ecd07155a1d339e09f417fe789c5aec959
font_02_sfnt_off0000f038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF038 10532 bytes
SHA-256: 5e506b953ec830ebac21298534074136c39853e170f6c9807e4c15c8f7d8fe8f