Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ce62493caeda1a5…

MALICIOUS

PDF

81.3 KB Created: 2021-04-28 23:41:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e41cdf1769a036b5d0be91dd9d16448c SHA-1: 2f22a47cda97fae77324775170d11a3961dd3646 SHA-256: 3ce62493caeda1a529b8f1d8556724ea7e47a83a59863eb23e3915388f3668dc
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links pointing to various PDF files hosted on disposable domains, indicating a link farm or SEO manipulation scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of numerous external URIs and the link farm heuristic confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://lozipotod.ru/strik?utm_term=los+hijos+de+sanchez+partitura+pdf PDF link annotation
    • http://worelimupuvefam.mywebcommunity.org/mietbrgschaft_vorlage.pdfIn PDF document text
    • http://meine-gebuhrenfrei.com/the_hobbit_ebook_free_download6titv.pdfIn PDF document text
    • http://hayatevesigar.online/44293120534pz1ly.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392195/normal_606e53ceed677.pdfIn PDF document text
    • http://4338bacchus.com/801577800632xd44.pdfIn PDF document text
    • http://sanatoriy-izumrudny.ru/new_testament_bible_stories_in_orderdt4gg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377114/normal_5febfa23e9eac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421612/normal_6038035ccb13e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407996/normal_603eb7a1e3da5.pdfIn PDF document text
    • http://vsspb.ru/98417526007zhomv.pdfIn PDF document text
    • https://nakalefa.weebly.com/uploads/1/3/4/5/134522788/xapepu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409628/normal_604a9380271ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423772/normal_605ca460aaac4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379491/normal_604eed0864faa.pdfIn PDF document text
    • https://zivopelorikeder.weebly.com/uploads/1/3/4/6/134677217/6f503977145a.pdfIn PDF document text
    • http://vovality.club/maxi_pads_no_wingsl78nf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383680/normal_6055b7b67dc6f.pdfIn PDF document text
    • http://rollernefritmassage.xyz/soundlogic_xt_wireless_charger_car_vent_phone_holder38qzl.pdfIn PDF document text
    • https://bitojobuf.weebly.com/uploads/1/3/4/8/134892495/rutaligu-potovukebutapa-fepiwowopusisud-lenuzewug.pdfIn PDF document text
    • http://kozugufasuroti.mygamesonline.org/waperukabikim.pdfIn PDF document text
    • https://fodivavix.weebly.com/uploads/1/3/1/4/131483454/limifagikomawimilido.pdfIn PDF document text
    • http://verifiedbadge-lnstagram.com/samsung_50_inch_4k_uhd_smart_tv_with_hdrwob7d.pdfIn PDF document text
    • https://tujelogujonugi.weebly.com/uploads/1/3/4/4/134491942/pusabubu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sakogabutal.onlinewebshop.net/tuzirigizinopem.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_off0000fdcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCC 5280 bytes
SHA-256: dd11c7ec2b99c2e2a29c379f24a446d06d3bbeeacbf249753d17957dfd71a273
font_01_sfnt_off00010fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCD 12196 bytes
SHA-256: d0001e6b9be10b5f87b313e0a3b14d9561eaa969bfd728ed32e47a856afe2ca0