Malicious PDF — malware analysis report

Static analysis result for SHA-256 cffb20eddbb3e705…

MALICIOUS

PDF

80.9 KB Created: 2021-02-10 17:52:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 39a9c9c29f9f17d2d317d8d0c009187a SHA-1: 167d3e08510a1a4241ce73b01b6d777c52fe8b5b SHA-256: cffb20eddbb3e7054f465b920a34e7992838db81b659af810a9b2233c2020420
184 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 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://yafferge.ru/aws?utm_term=acetal+copolymer+spec+sheet In PDF document text
    • http://winoraama.fun/nabotubenoveguwusitoco40x.pdfIn PDF document text
    • https://sererepe.weebly.com/uploads/1/3/3/9/133999843/togukijidugul_rokexipabelokap_kepaxa.pdfIn PDF document text
    • https://kinuguno.weebly.com/uploads/1/3/1/4/131454024/silifubijif_muvut.pdfIn PDF document text
    • https://lurenosofen.weebly.com/uploads/1/3/0/7/130740325/xixopuf_wunixaropetik_sinawisevif.pdfIn PDF document text
    • https://mumizajasaliso.weebly.com/uploads/1/3/4/5/134598274/606f29.pdfIn PDF document text
    • https://zubotovilep.weebly.com/uploads/1/3/4/5/134581484/lagavizegewoj_jisefegoxazola_lodikevewiret_noxixugojozo.pdfIn PDF document text
    • http://jopkapopka.online/54010577822wm8ag.pdfIn PDF document text
    • http://detonicinitalia.website/xuxolbq09r.pdfIn PDF document text
    • https://jasefukop.weebly.com/uploads/1/3/0/7/130776564/fisipij-kugolosel-xuketelokoniza-lapetuvu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nuvipapijulabu.epizy.com/linusini.pdfIn PDF document text
    • http://nolagevupuxuje.epizy.com/vuvezisevovifefipalasodej.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/burndown_chart_format.pdfIn PDF document text
    • http://ladinuronabo.epizy.com/38711875544.pdfIn PDF document text
    • http://nasakil.rf.gd/batman_returns_full_movie_tamil_dubbed.pdfIn PDF document text
    • http://wufizomofoduzin.rf.gd/the_beatles_revolver_full_album_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/alliteration_worksheets_ks2.pdfIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/43681717066.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00011102.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11102 21404 bytes
SHA-256: 8e6650eead2997f0a94678c4c160073eee1e5b3846c79374bde2dee684c36438
font_00_sfnt_off0000d896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD896 5264 bytes
SHA-256: cf4fc090dffed30216e713d705faa9dff26a083c8f127906c0195b77166ed6bf
font_01_sfnt_off0000ea57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA57 11240 bytes
SHA-256: ec09b1593908b8a54c8b2722612de5bcd2940bafdb04d4badcc69802344edc30

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