Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbf803c5c1e5aa53…

MALICIOUS

PDF

89.0 KB Created: 2021-03-02 08:31:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1321a95b3c45347d81e3c645d0811ee9 SHA-1: 12c4bf88901d4872cb2a060ed79a588b6fdbd020 SHA-256: bbf803c5c1e5aa53f09a833adddbff27af33683260b725f6961219faa05654f6
194 Risk Score

Malware Insights

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

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=econ+545+final+exam+answers+2018 PDF link annotation
    • https://lawoxotat.weebly.com/uploads/1/3/4/5/134587222/7af135.pdfIn PDF document text
    • https://lekikibobasiva.weebly.com/uploads/1/3/5/3/135350768/xupakivesamab-zugitexageruj-noxizerolival.pdfIn PDF document text
    • https://zuwufapiju.weebly.com/uploads/1/3/5/3/135348861/fixegupunasepizezudu.pdfIn PDF document text
    • https://tadilagene.weebly.com/uploads/1/3/1/3/131381422/b6af35ec.pdfIn PDF document text
    • https://cdn.sqhk.co/wimiwupo/OieNVnU/final_fantasy_ii_psp_walkthrough.pdfIn PDF document text
    • http://wijasagasipode.getenjoyment.net/53005894866.pdfIn PDF document text
    • https://povefedonigo.weebly.com/uploads/1/3/1/6/131637150/memadazetakuzuxifomo.pdfIn PDF document text
    • https://xemavuvewo.weebly.com/uploads/1/3/5/3/135394060/3164745.pdfIn PDF document text
    • https://petizigosi.weebly.com/uploads/1/3/4/9/134903326/xaloluxi-tabiwedebolevaj-nimivagobuv-niromajuti.pdfIn PDF document text
    • http://lixorajepidil.mygamesonline.org/integrated_chinese_level_1_part_1_textbook_3rd_edition_simplified__traditional.pdfIn PDF document text
    • https://mamufitixiru.weebly.com/uploads/1/3/4/6/134640278/riximegitetepaj_ditudelaratog_bixojaw_gawamog.pdfIn PDF document text
    • http://kexolifowuj.medianewsonline.com/how_to_clean_tefal_maxi_fry_fryer.pdfIn PDF document text
    • https://lasebotoxuxuxir.weebly.com/uploads/1/3/4/7/134729765/lujemifanef_vuzorikogaw_vanaladip_duledumet.pdfIn PDF document text
    • https://cdn.sqhk.co/xitilesuxiw/ibgjRif/music_stickers_free.pdfIn PDF document text
    • https://basosogufu.weebly.com/uploads/1/3/4/6/134682995/fidugafegi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://liroporuki.myartsonline.com/janot.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B05 5876 bytes
SHA-256: c09326323ce7b326223d713b9e835d74ac7d4e790060d99918f1da21d2849132
font_01_sfnt_off00012f1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F1F 11948 bytes
SHA-256: f33a0ce196aa092410530e8c8548283a6151236639d4216af1fa144dcd13b5e1

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