Malicious PDF — malware analysis report

Static analysis result for SHA-256 0899c6f98620df4c…

MALICIOUS

PDF

75.9 KB Created: 2021-03-28 10:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e573fae0c4e8b05f9e35e8a445bcb36c SHA-1: 116b10c8e2d47c838de7bf31e236e8ea8996c2c8 SHA-256: 0899c6f98620df4ca44fc692ba49e36170473360595bb95429a92441d1203d81
244 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that at least one URL points to known malicious redirector infrastructure. The ML classifier also flagged this PDF with high confidence. While no scripts were extracted, the sheer volume and nature of the links suggest a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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/strik?utm_term=farmer+boy+laura+ingalls+wilder+food In PDF document text
    • http://magic-world.site/25269930qbvi6.pdfIn PDF document text
    • https://cdn.sqhk.co/gewewoturila/0id7jji/zadedadigu.pdfIn PDF document text
    • http://genoray.pro/ideal_dzenin_olabileceini_kabul_ed6ky2f.pdfIn PDF document text
    • http://1xbet-registr.site/why_is_my_cox_dvr_not_recordingnjasf.pdfIn PDF document text
    • https://cdn.sqhk.co/puzadowoke/wic2hgr/29834142686.pdfIn PDF document text
    • http://submonster.xyz/dutavapudujapideyx4md.pdfIn PDF document text
    • https://cdn.sqhk.co/jesovolavig/PEjchd7/hydro_dipping_film_skulls.pdfIn PDF document text
    • http://ductsunlimitedins.com/breaking_silence_book_seriesyl0zh.pdfIn PDF document text
    • https://cdn.sqhk.co/fuluzagile/idejf14/jatilufiroguguz.pdfIn PDF document text
    • https://cdn.sqhk.co/wozejodes/GNpgcii/gnomes_garden_2_switch_review.pdfIn PDF document text
    • https://cdn.sqhk.co/bawijodol/pchd6Ow/basketball_shooting_form_stephen_curry.pdfIn PDF document text
    • http://cleaner-inn.club/download_camtasia_studio_7_for_windowsnppc4.pdfIn PDF document text
    • http://itanto.space/jiwijokuziroz7uj84.pdfIn PDF document text
    • https://cdn.sqhk.co/wanukawuwota/dhcgcif/85964481032.pdfIn PDF document text
    • https://cdn.sqhk.co/wujugojuse/cifhftj/228360769.pdfIn PDF document text
    • http://verification-help.business/cannery_row_john_steinbeck_amazon2zb58.pdfIn PDF document text
    • http://lnstagramverifycentre.com/how_to_backup_android_to_onedrive91mkz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c75ed97e-f406-4d79-b864-c99612e64be8.filesusr.com/ugd/a66d15_ff990091d7f7453680c2b2ab6dee3d2b.pdf?index=trueIn PDF document text
    • https://ad843f61-c544-48d7-8cfb-3c048b9edb46.filesusr.com/ugd/0dd9ed_429d150f6d164ffda08a57744f13763a.pdf?index=trueIn PDF document text
    • https://f3dbd103-cf2f-44fc-b0ad-c9004dc38af2.filesusr.com/ugd/1f2646_cf0d95a20e854a0dae876758094edb3a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d03d5415-3dcb-48c0-9050-afa797d7a2ec/52801875808.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a19293f-2bbd-4a0b-aaf2-151e354abbd1/74315538674.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_off0000eaaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAF 5516 bytes
SHA-256: 3b04d107e9972f325bf8a902a8303cfe3e2c4dd1a0a6046be84cad6cdd5172e8
font_01_sfnt_off0000fd70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD70 10340 bytes
SHA-256: 89bb10bb5d3554e7375f77b91da459f83857c97f89ed4b8e7e9e10e6ae742863