Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcfde1999e1e8a16…

MALICIOUS

PDF

126.0 KB Created: 2021-04-05 23:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c941c62c500378a80f0b9b20678f3076 SHA-1: 9fe383ae20f2f0fe95a7bb7637646129af64ce7f SHA-256: dcfde1999e1e8a16175545d67fdd10452c37af6e5c1ab56c473deda335f97416
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/award?keyword=addis+ababa+tourism+pdf PDF link annotation
    • https://lutaxebibutemun.weebly.com/uploads/1/3/1/3/131380730/bec25b647.pdfIn PDF document text
    • https://nizowidupisex.weebly.com/uploads/1/3/4/5/134502208/7547932.pdfIn PDF document text
    • http://wordwild-store.com/hogwarts_mystery_gobstones_answers_barnaby8gmlb.pdfIn PDF document text
    • https://tugoxovelosiju.weebly.com/uploads/1/3/0/9/130969774/24dc7dca8839.pdfIn PDF document text
    • http://dlkmvkoenv.info/sifopiwibufapinungvezm.pdfIn PDF document text
    • http://ontrade.top/9293297858hv1x5.pdfIn PDF document text
    • http://healthytrands.com/modern_calligraphy_book_lucy_edmondsk4bev.pdfIn PDF document text
    • http://wgathering.org/98208191356cbwhn.pdfIn PDF document text
    • http://nuverlites.online/android_os_distribution_by_countrysoeg2.pdfIn PDF document text
    • http://prechambre.xyz/what_is_the_unit_product_cost_using_absorption_costing0e6kb.pdfIn PDF document text
    • http://pshcomonhere.xyz/wuwaloxogabifovoxq2o2v.pdfIn PDF document text
    • https://mosezusimoz.weebly.com/uploads/1/3/1/6/131637881/41620.pdfIn PDF document text
    • https://zorusijumabek.weebly.com/uploads/1/3/4/8/134851431/zefejesewerigego.pdfIn PDF document text
    • http://mebelintera.ru/9217369616453t8b.pdfIn PDF document text
    • http://rezotu.xyz/14484996361ott9a.pdfIn PDF document text
    • https://tepadomuxufebe.weebly.com/uploads/1/3/1/3/131382092/foriw_jivobodalovuva_laresejotodujik_bipad.pdfIn PDF document text
    • http://kismykeitio.best/ballard_high_school_service_hoursj558q.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://75ca6b5e-a470-4e0e-8004-b00a9f1721b4.filesusr.com/ugd/1e4819_29be90c56e1d4f219bfba8bc7c81ae59.pdf?index=trueIn PDF document text
    • https://1fae3a98-13b7-4b95-b1f0-1fbd1b7b0aee.filesusr.com/ugd/1da05d_3fa7440232b34e66838b1e31bca05045.pdf?index=trueIn PDF document text
    • https://6e6ad6c0-90f2-4367-a025-4e24aeda1d0e.filesusr.com/ugd/c9b7fc_fc7a5bdf07994c4585d0a9a275ac1b48.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19950 5284 bytes
SHA-256: 50105a60d3d736aa8e6b3e98f689ef81173cc4124170fd434c7ed9fa11895bb9
font_01_sfnt_off0001ab2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB2B 11848 bytes
SHA-256: 32e7196e9d0e35baa70c624018ed9c7a35d23b9a6334edaa2bb63d448c1da806
font_02_sfnt_off0001d38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D38B 16876 bytes
SHA-256: a80ef9e1de66d79b2ac682f16e5a32e48a4c738d9c7897c4d2ec653101f5ce56