Malicious PDF — malware analysis report

Static analysis result for SHA-256 3526d820f47200ad…

MALICIOUS

PDF

69.3 KB Created: 2021-05-12 19:31:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: cd36602e65c4239514ca02b97fb780b3 SHA-1: 6e47776ee3ac82d9a4c5054892614801862080dd SHA-256: 3526d820f47200ad9762f2e76444eb0c6d350f211bd9f3975a09f38bcbaba68d
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO spam campaign. The embedded URL `https://maypoin.ru/strik?utm_term=ti+30xs+multiview+calculator+online+use` suggests a lure related to a calculator tool. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious intent, likely for phishing or traffic redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/strik?utm_term=ti+30xs+multiview+calculator+online+use PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470523/normal_6033b52ce20c6.pdfIn PDF document text
    • https://cdn.sqhk.co/bupewazadufa/hcjjheO/pax_app_ios_13.pdfIn PDF document text
    • https://mixajogidevo.weebly.com/uploads/1/3/0/9/130969427/logobigeluwabazari.pdfIn PDF document text
    • https://cdn.sqhk.co/pixisuja/jthb7tu/bozezedizepibaremut.pdfIn PDF document text
    • https://cdn.sqhk.co/tavaxikanabu/6gcjfhb/wozef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457014/normal_601ad36f40aac.pdfIn PDF document text
    • https://lokulubebu.weebly.com/uploads/1/3/1/8/131856352/7767948b91a.pdfIn PDF document text
    • https://mefupajudeto.weebly.com/uploads/1/3/4/8/134883840/8296642.pdfIn PDF document text
    • https://zukutalemuz.weebly.com/uploads/1/3/4/5/134582669/tifalif.pdfIn PDF document text
    • https://pepodefaposuv.weebly.com/uploads/1/3/5/9/135992330/paresexobof.pdfIn PDF document text
    • https://timelasabo.weebly.com/uploads/1/3/4/3/134345700/b3260526e8b.pdfIn PDF document text
    • https://raralulewuk.weebly.com/uploads/1/3/4/4/134478892/3141.pdfIn PDF document text
    • https://dedotomonifagax.weebly.com/uploads/1/3/1/6/131606429/411631a1fba1e55.pdfIn PDF document text
    • https://guwokizesagemi.weebly.com/uploads/1/3/4/8/134855090/religolekujebag_botojijebajoxe_zidil_fupifipiwafe.pdfIn PDF document text
    • http://xukuvapama.iblogger.org/avast_free_antivirus_2018_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457577/normal_5ffa9cba527c5.pdfIn PDF document text
    • https://pujapuvefebawu.weebly.com/uploads/1/3/4/5/134581836/lafosodimivoxumid.pdfIn PDF document text
    • https://cdn.sqhk.co/pigajifaw/g0gcMij/roman_empire_conquered_judea.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/I9heZkw/mykumc_email_login.pdfIn PDF document text
    • https://visofamawuri.weebly.com/uploads/1/3/2/3/132303269/kozolim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tenurusimuxu.epizy.com/george_foreman_outdoor_grill_amazon.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_off0000cea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA1 5420 bytes
SHA-256: 3c7c91a201c7a7db92b3606524c96541d27b4374da17a68a7adf1748bd3ba7ee
font_01_sfnt_off0000e10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10E 11376 bytes
SHA-256: 8d28040d80936700e513d6a7176a28f6d5ced2a00ae9d00f08420fa6d24f8d32