Malicious PDF — malware analysis report

Static analysis result for SHA-256 44c8bd8883549042…

MALICIOUS

PDF

74.3 KB Created: 2021-02-25 09:12:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 325c5f650151f4a3418c77baf95b58fb SHA-1: c69b1d6c16f9d624bab0370253baad45ac5003b6 SHA-256: 44c8bd8883549042c4897d8d1173de9ddc226f1e2c1656d58ef54f5be749eb73
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://leonvi.ru/award?keyword=what+is+a+pure+trust+organization PDF link annotation
    • http://top-shop-store.website/dageronimonujulobatajakagymlua.pdfIn PDF document text
    • https://cdn.sqhk.co/zezinojox/Fibhehg/toshiba_amazon_fire_tv_remote_pairing.pdfIn PDF document text
    • https://xulozajewe.weebly.com/uploads/1/3/1/3/131384688/6195667.pdfIn PDF document text
    • https://jebovemedafo.weebly.com/uploads/1/3/0/8/130813903/2614126.pdfIn PDF document text
    • https://wisatevifo.weebly.com/uploads/1/3/0/7/130775851/rolirakuxo.pdfIn PDF document text
    • https://duluvozega.weebly.com/uploads/1/3/5/3/135327827/bd5e88.pdfIn PDF document text
    • https://cdn.sqhk.co/mewobonovagi/MhjMupI/naralonidobi.pdfIn PDF document text
    • https://cdn.sqhk.co/defisepeniba/hdIhjp2/fanedaxisesajigusezuxuv.pdfIn PDF document text
    • http://smallita.space/vivoge5k842.pdfIn PDF document text
    • http://bbcua.site/tetogutajawetawuzasalevej98yj0.pdfIn PDF document text
    • https://cdn.sqhk.co/rifojimuna/ru1iftw/biztalk_mapper_visual_studio_2019.pdfIn PDF document text
    • https://pevidutapare.weebly.com/uploads/1/3/0/7/130740538/6993728.pdfIn PDF document text
    • https://sibozigoguxo.weebly.com/uploads/1/3/0/9/130969143/1382326.pdfIn PDF document text
    • https://cdn.sqhk.co/luwagoma/MhfaUhh/fapiwuzokuxafinidesovuzaw.pdfIn PDF document text
    • https://mekapejodefab.weebly.com/uploads/1/3/4/7/134740006/nusidokuxasu-widipibitadasig-jokamataz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kozifina.epizy.com/xitedelatuwibogalepazugok.pdfIn PDF document text
    • http://tatoguninorevem.epizy.com/besopusajixen.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_off0000e5fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FD 5112 bytes
SHA-256: 39cb67f63f75a14723cc640c8c4c63992a8c09756b7dd9d69ac48e78a63b170f
font_01_sfnt_off0000f774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF774 10600 bytes
SHA-256: 52b14bf0364f0bbb62f5c5a00c7eee152312d4e10663683f46f5565e25e0ef92

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