Malicious PDF — malware analysis report

Static analysis result for SHA-256 d423ba6b2b976d03…

MALICIOUS

PDF

79.3 KB Created: 2021-04-20 05:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 9919d973d124b8e59dd5a371a58a6384 SHA-1: eab2a8ba1d1a0064cff2ebda4d410c02d48b374d SHA-256: d423ba6b2b976d039bb4de1bfcc5ba2db43c4ab6cd33ac4a83cbb18d19ab509b
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URLs point towards an attempt to redirect users to potentially harmful content, possibly for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://nipisod.ru/strik?utm_term=bella+pro+series+belgian+flip+waffle+maker+reviews PDF link annotation
    • https://cdn.sqhk.co/sugigevapure/fVmpicH/powerbass_asa_1500._1dx_price.pdfIn PDF document text
    • https://dabosuze.weebly.com/uploads/1/3/2/6/132695252/rupebe-sanajalogoleb-nuduwagataki.pdfIn PDF document text
    • http://jonipifenukiz.mygamesonline.org/canon_lide_400_scanner_specification.pdfIn PDF document text
    • https://gudugobaxav.weebly.com/uploads/1/3/4/5/134500737/wewunejo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373016/normal_60542db00e713.pdfIn PDF document text
    • https://foziwumiwogesis.weebly.com/uploads/1/3/5/3/135321673/8205337.pdfIn PDF document text
    • http://draiwenstore.online/2017_chevy_colorado_diesel_performance6jm9u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479240/normal_6055677e3d827.pdfIn PDF document text
    • https://fazipebafutemi.weebly.com/uploads/1/3/1/8/131857540/lozixerowotuj-tuzutiriwavon.pdfIn PDF document text
    • http://fomejejavegod.sportsontheweb.net/avatar_kyoshi_novel.pdfIn PDF document text
    • https://fusorebumobem.weebly.com/uploads/1/3/3/9/133986296/duzakonaw-wavopalufa.pdfIn PDF document text
    • http://dusipoweg.mywebcommunity.org/31671813922.pdfIn PDF document text
    • http://jedilinosur.mywebcommunity.org/80308714711.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499935/normal_5fe1f82957f31.pdfIn PDF document text
    • https://cdn.sqhk.co/neliwuwo/eFgfjfa/dune_2020_film_release_date.pdfIn PDF document text
    • https://cdn.sqhk.co/tulotunofuz/igtpjdA/xogeretekavemaw.pdfIn PDF document text
    • https://xidelefexowivap.weebly.com/uploads/1/3/4/3/134366840/mavoje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402289/normal_5fd89cdbcd7b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446494/normal_602fbfb8e4b30.pdfIn PDF document text
    • http://artistichomesolutions.com/why_was_the_constitution_of_1791_importantjtzam.pdfIn PDF document text
    • https://cdn.sqhk.co/filodomazora/azhpifd/police_dog_simulator_3d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CA 5628 bytes
SHA-256: 157b3f17bcd9392cd6d14ff70c0db6f5222a327ce62c18606e8b5e853fdaec20
font_01_sfnt_off0000fcf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF0 11812 bytes
SHA-256: 7b4f823be9c0bf4f543b2eca07dacdb0d86d72dd8eb752454dcb0879f2e173e3
font_02_sfnt_off00012528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12528 2604 bytes
SHA-256: 396fb681f43981c8d70516a331c6051ae7a595f0867e9e35ec319b08e4bd7a34