Malicious PDF — malware analysis report

Static analysis result for SHA-256 19dac9f67fb42cfb…

MALICIOUS

PDF

78.5 KB Created: 2021-05-10 23:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f4f66dfdcf49fc98953f171a1596b718 SHA-1: b197a747534b0f5030853bd4ddb5d545c7b4b3bc SHA-256: 19dac9f67fb42cfbfbc634f650d6bc3782a84c54e0dcca1c15f8927de2f6ecb7
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to contain keywords related to product listings, reinforcing the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/strik?utm_term=lg+g2+f320+lcd+replacement PDF link annotation
    • http://complerbnp.com/meade_starfinder_telescope_model_114eq-dh488hj0.pdfIn PDF document text
    • https://cdn.sqhk.co/wajerewuwer/jiahi4v/lilufevavimezadevebuzid.pdfIn PDF document text
    • https://cdn.sqhk.co/sifujubagis/egiridt/dubetemuridejonoxexiwina.pdfIn PDF document text
    • http://gavediteriremuv.medianewsonline.com/cbse._nic._in_sample_papers_class_10_2020.pdfIn PDF document text
    • http://ig-mediateam.net/carmina_burana_choral_score7436v.pdfIn PDF document text
    • http://fejekadiwoxobiz.getenjoyment.net/pebipoxebobilozivalanogal.pdfIn PDF document text
    • http://geparup.scienceontheweb.net/escala_cromatica_guitarra_electrica.pdfIn PDF document text
    • https://cdn.sqhk.co/lajagika/xhcBZCP/mabedemenobuzare.pdfIn PDF document text
    • https://cdn.sqhk.co/potasuregoz/rnlhcia/skull_coloring_books_for_adults.pdfIn PDF document text
    • http://minosijasif.mypressonline.com/lp_bronkiolitis_pada_anak.pdfIn PDF document text
    • http://nefutekugurenap.mygamesonline.org/76868364663.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kopunumepoz.rf.gd/83590474308.pdfIn PDF document text
    • http://xifuxedoka.rf.gd/95104667293.pdfIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/xasadogologu.pdfIn PDF document text
    • http://bosotosevizava.rf.gd/3424198041.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/rune_pure_barrows_gloves_guide.pdfIn PDF document text
    • http://tifalupu.rf.gd/converter_para_word_i_love.pdfIn PDF document text
    • http://juborekif.atwebpages.com/36910270600.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_off0000e698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE698 5308 bytes
SHA-256: 065fd6c5fb9706153d2812ac89cd0b6ddb458b88fcb2fa4bb7365d13f5a9085b
font_01_sfnt_off0000f87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87C 11636 bytes
SHA-256: 3edc0ef4d4062445f65f9ca55d1037017707dd7c5762b888921ec805339081bc
font_02_sfnt_off00011ee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE0 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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