Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7c8c72d819686dd…

MALICIOUS

PDF

94.7 KB Created: 2021-01-28 13:42:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 2f94172b0aaa4ef0f2543509d5420078 SHA-1: d2d38e922e75628cfbd7a77319cc2b56af4a78ec SHA-256: c7c8c72d819686ddfc1ce851161ed63b050e84ab109d9ebdc09bcadacd871513
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains and Weebly/epizy hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for SEO manipulation or to distribute phishing content. The presence of numerous external links, including one with a UTM parameter, supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://jacksth.ru/123?utm_term=plus+one+launcher+apk PDF link annotation
    • https://cdn.sqhk.co/vadetegubufo/jfgdghO/death_bike_3d_download.pdfIn PDF document text
    • https://kosofisipituje.weebly.com/uploads/1/3/5/3/135329454/3276992.pdfIn PDF document text
    • https://delovamubikener.weebly.com/uploads/1/3/4/7/134707073/275340.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzewekafan/cogengf/doweduvijodomega.pdfIn PDF document text
    • http://all-system7.work/biblia_de_estudio_diario_vivir_gratis9t7d9.pdfIn PDF document text
    • https://bitujidup.weebly.com/uploads/1/3/4/5/134598072/govetiba.pdfIn PDF document text
    • https://cdn.sqhk.co/sifajoxojif/gBge4VL/32869110449.pdfIn PDF document text
    • http://vezerfa.xyz/como_descargar_stickers_de_memes_en_whatsapp_iphonesnfg7.pdfIn PDF document text
    • http://ashotik.space/rokijod2r8gz.pdfIn PDF document text
    • https://zuzedunili.weebly.com/uploads/1/3/4/4/134460484/035510.pdfIn PDF document text
    • http://matrixbicycles.com/belutikitupefawgc0m2.pdfIn PDF document text
    • https://pakakisokuz.weebly.com/uploads/1/3/1/3/131381756/4a53e418b5e7.pdfIn PDF document text
    • https://rajevolid.weebly.com/uploads/1/3/0/8/130813967/2429928.pdfIn PDF document text
    • https://cdn.sqhk.co/vupapevixu/jj6hjgg/54528894163.pdfIn PDF document text
    • https://dolibaradodusop.weebly.com/uploads/1/3/4/5/134595809/6eb66630f2d4047.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/geradi/crusaders_of_light_guide_ranger.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/pepidunenajatodezeborer.pdfIn PDF document text
    • http://vizulubafaxal.epizy.com/wedding_card_design_template_online_free.pdfIn PDF document text
    • http://kuzebelinebofe.epizy.com/23205112724.pdfIn PDF document text
    • https://s3.amazonaws.com/midipes/aashiqui_1990_songs_pagalworld.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxefemebidaz/92450507158.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0001475d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1475D 20724 bytes
SHA-256: a79a16ba4878b1e276510601a6d8ef4b324820fc122240a61b19004ec15bb379
font_00_sfnt_off0000e0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EB 5088 bytes
SHA-256: 1b7cd489771cc22f3946505f0521fff327ec741c561539c7d609a9fe7e8b5795
font_01_sfnt_off0000f22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22B 17128 bytes
SHA-256: eba0337dd07e8d574fbe3bba0cfb60a95f8c47481073effd16f40b3fd55c0202
font_02_sfnt_off000121d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D4 10924 bytes
SHA-256: 3754f69a4263831de492d3333f056109556d7dfe9106867c97693d9a3f6bcfb4