Malicious PDF — malware analysis report

Static analysis result for SHA-256 f16c82807db89a07…

MALICIOUS

PDF

82.5 KB Created: 2021-03-29 14:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e7b8a1bc0d4b95688a4cfab2d9fd749e SHA-1: 13e770eea50419e77f46cf82d134680f75c2e817 SHA-256: f16c82807db89a071db18db1423fdc14f57b7f7ce1b2d019cf8a46c43326b5a8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://mezovuduw.ru/strik?utm_term=american+journey+salmon+and+sweet+potato PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366321/normal_603c3d7a3da79.pdfIn PDF document text
    • http://koponegigat.medianewsonline.com/68457296637.pdfIn PDF document text
    • http://jakor.pro/motorola_mc5590_drivervj7b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470689/normal_602f961395fbb.pdfIn PDF document text
    • http://smotrikino.fun/777872300829irlm.pdfIn PDF document text
    • http://i12tws.website/255195625llyhj.pdfIn PDF document text
    • http://wedasuf.getenjoyment.net/88530440303.pdfIn PDF document text
    • http://fivadoguna.medianewsonline.com/miduz.pdfIn PDF document text
    • http://fakts.design/76568439403u0ngc.pdfIn PDF document text
    • http://pinerapidsrr.com/dewofodevojavapifezogu3zb6s.pdfIn PDF document text
    • http://madamzero.com/does_dmso_reduce_swellingja1os.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444647/normal_5ff5f15b99069.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482188/normal_603eb9f44ca1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401982/normal_603d3c63acf14.pdfIn PDF document text
    • http://moxilekulina.getenjoyment.net/75880232707.pdfIn PDF document text
    • http://auth02mobility.com/what_causes_light_flickering_in_eyes0toz2.pdfIn PDF document text
    • http://pararapameso.getenjoyment.net/cantilever_steel_beam_design_calculation.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kebenubes.onlinewebshop.net/jumotivibetubitugikaviv.pdfIn PDF document text
    • https://s3.amazonaws.com/nademopor/amalina_song_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/dusubonifu/dota_1_items_build_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/48360854352.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/the_atomic_weight_of_chlorine_is_reported.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_off000104a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A0 5476 bytes
SHA-256: 1acc6605b8c4776e013b201219506f34c5b81af6caed88f9d0222764338ef880
font_01_sfnt_off00011743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11743 10988 bytes
SHA-256: 460cfad5c46f369c95e3b265aae1788baca36ef4cb4b04e9f4938ac173ff2fec

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