Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1da21d1b18a2512…

MALICIOUS

PDF

120.8 KB Created: 2021-01-15 08:31:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: cf3a2a0f4cfd4cae348a36c2f94f0f6d SHA-1: ba616996e395c542f2e2d5bb700ddf42ec6eb792 SHA-256: f1da21d1b18a25120b4a2c8341f3fe19943d801682eace2c55c91141d71b076f
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting, and one specifically to a known malicious redirector. This indicates a link farm designed to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the structure suggests a malicious document intended to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffking.ru/123?utm_term=gw2+thief+hero+points+guide In PDF document text
    • https://fogoravirekan.weebly.com/uploads/1/3/4/3/134335139/5280471.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489724/normal_5fc1c6adc1fd2.pdfIn PDF document text
    • https://site-1176739.mozfiles.com/files/1176739/65997463598.pdfIn PDF document text
    • https://kibodowusi.weebly.com/uploads/1/3/4/5/134588916/7ac1b193518bea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383805/normal_5ffdb48210410.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391319/normal_5fbea51fa733d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485580/normal_5fb8c848d4c33.pdfIn PDF document text
    • https://kodowogokilikid.weebly.com/uploads/1/3/4/4/134466607/jadewipof.pdfIn PDF document text
    • https://wazijewafaset.weebly.com/uploads/1/3/4/4/134437152/lufatilanogufir-kavemaramulate-vipamebul.pdfIn PDF document text
    • https://rajevolid.weebly.com/uploads/1/3/0/8/130813967/a972ef549f0f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451567/normal_5fa717075255f.pdfIn PDF document text
    • https://site-1228309.mozfiles.com/files/1228309/laboratory_laboratory_report.pdfIn PDF document text
    • https://site-1177316.mozfiles.com/files/1177316/tv_guide_cairns_the_fix.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/numegubowalonan/14837824821.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/rufonefedanidisul.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/buenos_aires_metro_map.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
    • 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_off0001887a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1887A 5316 bytes
SHA-256: 3fddd57bea64f3cbfdc91f239e4fe445e2c105b0c8f1e35062585a8afc5ce25c
font_01_sfnt_off00019aa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19AA9 11136 bytes
SHA-256: cdb04ba0ad7962d43366e6abf3ca732c43797fad6a3b844129ecb263a317d961
font_02_sfnt_off0001c0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C0DE 16096 bytes
SHA-256: 3bb08857b08983a257d5a2052628e18542fd51c8d29f5bbef87ea8b8ace00841