Malicious PDF — malware analysis report

Static analysis result for SHA-256 916b84e19e019dcc…

MALICIOUS

PDF

103.7 KB Created: 2021-02-05 11:09:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 1cc3a44c72f964bd404bf3cfd826d7e6 SHA-1: 753cba98323e18f889f10c981da06dc649fa9e37 SHA-256: 916b84e19e019dcc044279ec88bfc94e1b781731f2bfbca8f46a46caad4595d5
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to suspicious domains, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the embedded links suggests a phishing or malware distribution vector, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/aws?utm_term=sheet+erosion+definition+earth+science In PDF document text
    • http://vorusobowa.66ghz.com/hemarthrosis_treatment_guidelines.pdfIn PDF document text
    • https://dazuzezabemor.weebly.com/uploads/1/3/1/3/131380892/wizavokiketeve.pdfIn PDF document text
    • http://bullbananavannaone.xyz/the_mortal_instruments_city_of_ashes_free9tksy.pdfIn PDF document text
    • https://cdn.sqhk.co/minutakumu/91gcgc1/o2jam_music_and_game_apk_download.pdfIn PDF document text
    • https://namonivet.weebly.com/uploads/1/3/4/4/134493383/b10d494b.pdfIn PDF document text
    • http://ezfix.asia/dewalt_miter_saw_parts_dw708vewjb.pdfIn PDF document text
    • http://leftoutclub.com/arne_jacobsen_station_alarm_clock_manualm1xeg.pdfIn PDF document text
    • https://xitarowax.weebly.com/uploads/1/3/2/6/132681505/ruwuzexadasuv_xelor.pdfIn PDF document text
    • https://cdn.sqhk.co/jotenitix/jiOShMc/huey_lewis_sports_songs.pdfIn PDF document text
    • https://vomizovuzib.weebly.com/uploads/1/3/1/6/131637161/wenerifodulaze_putarexanuboxiz_luwusul.pdfIn PDF document text
    • http://maska-respirator.shop/fikokutakuduwitugy5h2k.pdfIn PDF document text
    • https://rofosuvobatijam.weebly.com/uploads/1/3/4/6/134661532/78e42abddd91bb.pdfIn PDF document text
    • http://zujakupuk.22web.org/88294388226.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pitefabe.epizy.com/68438850997.pdfIn PDF document text
    • http://divamepirinati.rf.gd/pezoxunidet.pdfIn PDF document text
    • http://tesezozujib.epizy.com/kufejosixese.pdfIn PDF document text
    • http://gubodasitonobu.epizy.com/kamedajexigobibigefe.pdfIn PDF document text
    • http://nalikala.epizy.com/21560443832.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_off000159b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159B8 5180 bytes
SHA-256: 4437e980f2069bd0f8551f63286d1dcbfd677584992f0fbe28d312d3a8cf5437
font_01_sfnt_off00016b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B4C 11188 bytes
SHA-256: 2d0c571a2d3c66abd2a9db164535abdf1a37829819c0b40f0c3401f3905bea2f

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