Malicious PDF — malware analysis report

Static analysis result for SHA-256 37c925d85b0adaa3…

MALICIOUS

PDF

83.4 KB Created: 2021-03-27 19:00:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 3f1f6fca125f1884e326c6b2f06de973 SHA-1: 0fb417922ede394f0b1ee6517c29dcc06bd014f3 SHA-256: 37c925d85b0adaa311d3adc1c35afb6e9c831ed049b718aac5ed39abbd3945f4
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, many of which host PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on low-reputation hosting, likely to distribute malware or conduct phishing. While no scripts were explicitly extracted, the presence of external URIs and the overall structure suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/wix?keyword=psiphon+plus+handler+apk+download PDF link annotation
    • http://bestsaleshopin.xyz/rush_hitam_20186s3cy.pdfIn PDF document text
    • http://clientbluebadge.com/holmes_humidifier_cool_mist_walmart2sf6c.pdfIn PDF document text
    • http://babitilakibo.mywebcommunity.org/5708467080.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409610/normal_600f2c760a6bc.pdfIn PDF document text
    • http://fasajesova.22web.org/75359353683.pdfIn PDF document text
    • http://gekodejevotug.medianewsonline.com/64265941229.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409813/normal_600405c97103a.pdfIn PDF document text
    • http://kerutugizuxig.mygamesonline.org/firinuv.pdfIn PDF document text
    • http://zasaluto.iblogger.org/ethoxylation_process.pdfIn PDF document text
    • http://sewonmedix.ru/how_to_thread_a_bobbin_kenmore_mini_ultracj453.pdfIn PDF document text
    • http://kijorifoweb.22web.org/pifijidebew.pdfIn PDF document text
    • http://fesupopimos.66ghz.com/76842306033.pdfIn PDF document text
    • http://gezetola.scienceontheweb.net/actionscript_3._0_game_programming_university.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372383/normal_6023d421adeb0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nawexox.epizy.com/84490769724.pdfIn PDF document text
    • http://lufogadiza.rf.gd/voxedifemegibabezejol.pdfIn PDF document text
    • http://kapizepaninufo.epizy.com/xijidavigozi.pdfIn PDF document text
    • http://bumisalozik.rf.gd/nofunosufofomito.pdfIn PDF document text
    • http://xobibaga.myartsonline.com/81961335058.pdfIn PDF document text
    • http://nanaxidimidi.atwebpages.com/36718366802.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF780 5204 bytes
SHA-256: 885976a7def2e35ffb7b7614f6b17258cc3a50ed71fc0f2a31408de65a4fd7e5
font_01_sfnt_off00010934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10934 4104 bytes
SHA-256: 5b54635c98174a2a739a1429edc9985f43e5295850c58cb23dac54b6f9f8babb
font_02_sfnt_off0001182e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182E 11344 bytes
SHA-256: f340f8f996eb04cc698d45d7639e68d015adbd7e11f5fd477f786ffd6babfb24

Open this report in the interactive analyzer, or submit your own file for analysis.