Malicious PDF — malware analysis report

Static analysis result for SHA-256 928a73ec7e1a4822…

MALICIOUS

PDF

93.2 KB Created: 2021-04-05 11:41:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: fa80733ee073e0e4a9ec42b1516986b1 SHA-1: 1ecfcf7feb94f9c82261bc0b4495d924b15a8734 SHA-256: 928a73ec7e1a4822c827f4f51e047b8533f2a5a13c76c507672a95b645ea17db
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malicious redirection attempt, likely leveraging techniques to bypass security measures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://zajinet.ru/award?keyword=learn+assyrian+language+pdf PDF link annotation
    • https://befofevaz.weebly.com/uploads/1/3/0/9/130969220/7003480.pdfIn PDF document text
    • http://poopo.ru/sinilesakuo74o.pdfIn PDF document text
    • https://wanalupegekiful.weebly.com/uploads/1/3/4/8/134879682/364471.pdfIn PDF document text
    • http://gezetola.scienceontheweb.net/ascites_in_cats.pdfIn PDF document text
    • https://tadomowiwelam.weebly.com/uploads/1/3/4/7/134744739/voboni_gugafo_tesosi.pdfIn PDF document text
    • http://manybigs.space/196344803247mo9t.pdfIn PDF document text
    • http://goxuvux.22web.org/ubuntu_32-_bit_server_edition.pdfIn PDF document text
    • http://bazunujovi.scienceontheweb.net/malayala_manorama_calendar_2020_december.pdfIn PDF document text
    • https://kibugaduxabe.weebly.com/uploads/1/3/4/5/134510017/xowak_fukujagilizow_xuvikezawepav.pdfIn PDF document text
    • http://wozekozexufoxol.scienceontheweb.net/borg_scale.pdfIn PDF document text
    • https://gojenejanoz.weebly.com/uploads/1/3/0/7/130739654/dakojopakesit_dawodekumijo_nopodi.pdfIn PDF document text
    • https://nesexabaxurozij.weebly.com/uploads/1/3/4/8/134898102/177892.pdfIn PDF document text
    • https://wupugilitem.weebly.com/uploads/1/3/6/0/136020535/4564939.pdfIn PDF document text
    • http://wejuveziwep.mypressonline.com/genoruguse.pdfIn PDF document text
    • http://itmax.info/introduction_to_embedded_systems_using_microcontrollers_and_the_msp430lvrrq.pdfIn PDF document text
    • http://zeboxagekej.sportsontheweb.net/simijogukodu.pdfIn PDF document text
    • http://copalofa.site/15356081219qzx2a.pdfIn PDF document text
    • http://wofoweniwer.iblogger.org/snowbear_trailer_specifications.pdfIn PDF document text
    • https://motanaweda.weebly.com/uploads/1/3/4/3/134316912/f6cc6c0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d992f69e-bc5b-430a-92d7-abfd66d0380b.filesusr.com/ugd/6f7357_015e01fd78fd48098ba4e3c5e99230bf.pdf?index=trueIn PDF document text
    • http://kalilom.epizy.com/runescape_auto_typer_free.pdfIn PDF document text
    • https://c0e8410b-c394-4b36-8083-179878a46647.filesusr.com/ugd/d4b1dc_f7e0bb3062ee4348aa4513211393a9d8.pdf?index=trueIn PDF document text
    • https://921790ca-7b53-43bd-a25d-275d6f056404.filesusr.com/ugd/9d24cb_56bad5f54b5440a0b205ed3b81a558d9.pdf?index=trueIn PDF document text
    • https://59548cc9-d6a6-4b2e-bd73-2bfb7290c7b5.filesusr.com/ugd/3fd21f_288e53f73fba47698fb782f4c304dc95.pdf?index=trueIn PDF document text
    • https://f635e5d9-31b1-4f19-b758-7a623be10181.filesusr.com/ugd/6cf0f5_54865d63cd314ef7b24836dde0080354.pdf?index=trueIn PDF document text
    • http://gokuviwibosug.rf.gd/vepoxugofedikuxugimu.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_off00012e9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E9E 5252 bytes
SHA-256: 2e17e4bb121a83fa2017c25e45993e9dc9fc81b51ad1031a7178b8c140982098
font_01_sfnt_off0001409c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1409C 11424 bytes
SHA-256: 984fda6f55908857db424d8c47759a2f7ac4dce5a0cc89ac78de72fb5cde2500