Malicious PDF — malware analysis report

Static analysis result for SHA-256 80dd8fdd2c4bd96f…

MALICIOUS

PDF

79.3 KB Created: 2021-03-11 22:08:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4b6fb443e28ad3377d09509c82af09ae SHA-1: 2bcc6c2bbcdbef8245678c4ddf5cc069d6178d57 SHA-256: 80dd8fdd2c4bd96f07ec61e842090d447155ab4eb60293ebff420ef3bfc874e8
264 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating it contains malicious content. It features a large number of embedded links, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. One critical heuristic identified a link to known malicious redirector infrastructure, specifically `https://crophysi.ru/strik?utm_term=how+to+reset+chamberlain+liftmaster+formula+1`, which is likely used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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=how+to+reset+chamberlain+liftmaster+formula+1 In PDF document text
    • https://cdn.sqhk.co/jinavefajevo/jbHDjar/cultist_base_doom_eternal_soundtrack.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494140/normal_602d2cffc9dfc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470968/normal_5fc5f582ca291.pdfIn PDF document text
    • https://pirovosarelivo.weebly.com/uploads/1/3/1/4/131406751/zaxawetodevuratuju.pdfIn PDF document text
    • https://dijekoko.weebly.com/uploads/1/3/5/3/135315120/kareramex-wowivikos-xetuvinez.pdfIn PDF document text
    • http://stalekost.site/ingles_sin_barreras_precio_colombiajlo5h.pdfIn PDF document text
    • https://logifuvixejexa.weebly.com/uploads/1/3/6/0/136019385/4003484.pdfIn PDF document text
    • https://riguzegadediva.weebly.com/uploads/1/3/5/3/135314075/cce362.pdfIn PDF document text
    • http://reetodo.online/defiant_lighting_manualjnmdz.pdfIn PDF document text
    • https://rujunile.weebly.com/uploads/1/3/2/7/132710621/ludaxux.pdfIn PDF document text
    • http://visionnew.xyz/didezoyl2bl.pdfIn PDF document text
    • https://cdn.sqhk.co/josedinis/jeidYIT/bopoxowipalikesinetu.pdfIn PDF document text
    • https://cdn.sqhk.co/libodinidep/4igbicV/ballet_hop_st_laurent.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467287/normal_6009db4d47bf8.pdfIn PDF document text
    • https://lapolepep.weebly.com/uploads/1/3/1/4/131406498/suvunewatesuj_dozekar.pdfIn PDF document text
    • https://tumunuwixa.weebly.com/uploads/1/3/1/3/131384432/lejaxavotewikujufe.pdfIn PDF document text
    • https://latolupolazu.weebly.com/uploads/1/3/4/0/134017494/b726a.pdfIn PDF document text
    • http://befodafojedugan.22web.org/tukabigasaxomajasipepaga.pdfIn PDF document text
    • https://cdn.sqhk.co/gituridewo/ezajgjd/weekend_jobs_los_angeles.pdfIn PDF document text
    • http://glossywp.online/lexijuvx1m.pdfIn PDF document text
    • https://getukesi.weebly.com/uploads/1/3/4/7/134735407/mukafuv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tafikepuvanotu.epizy.com/xukozetipubazovurolaf.pdfIn PDF document text
    • http://dijakobikegexi.epizy.com/zokatinasopowojizu.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_off0000f8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E1 5364 bytes
SHA-256: a044555caf87a0f30a3bf4f676fe07b840da44f66fd1daf1d85ed8b9c8079337
font_01_sfnt_off00010b0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0F 10536 bytes
SHA-256: 385ad2338decf3957541362a6e41d37c8f2f2dbb41307fb85118d5179bf117a8

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