Malicious PDF — malware analysis report

Static analysis result for SHA-256 c88a327044f96330…

MALICIOUS

PDF

78.6 KB Created: 2021-04-02 22:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5c063b3344beb84d75db892ceb112f36 SHA-1: 593da418ce85d7d25b5514db99932777a14c8ebd SHA-256: c88a327044f963306f58e9b7cf66388705c846039fb0ad7703c1bfda1185f2f0
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 0.9998

Heuristics 5

  • 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 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://jacksth.ru/award?keyword=carranza+periodontology+free+download+pdf PDF link annotation
    • https://cdn.sqhk.co/pabopimi/haXXhhZ/terijuvabade.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484375/normal_5ff38bfd829d8.pdfIn PDF document text
    • http://vvd.bar/clip_tiktok_b_mz4q8t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481839/normal_6048cfb87c21b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483075/normal_600d5f3ee6904.pdfIn PDF document text
    • http://dororuminaxa.mywebcommunity.org/arctic_king_8_000_btu_portable_air_conditioner_reviews.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369524/normal_6002df5b4d4f3.pdfIn PDF document text
    • https://cdn.sqhk.co/vonofuguniti/zhaigZJ/partnership_account_balance_sheet_format.pdfIn PDF document text
    • https://cdn.sqhk.co/tamupoto/YibZkjd/smashburger_near_me.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379723/normal_5fdff6a14808a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369629/normal_6059167bf157e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366057/normal_6009146e58bd4.pdfIn PDF document text
    • http://fetedeju.mygamesonline.org/lipid_oxidation.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366358/normal_6047820e41bc2.pdfIn PDF document text
    • http://pimifawimonidij.mywebcommunity.org/what_does_frankenstein_represent.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474169/normal_5fcc1d6a108cd.pdfIn PDF document text
    • http://rotawafuwuno.scienceontheweb.net/radio_anatomie_du_pied.pdfIn PDF document text
    • http://keto-s1.com/dd_5e_players_handbook_amazonmhgl1.pdfIn PDF document text
    • https://cdn.sqhk.co/kebabefepu/gicUjau/android_auto_wireless_ford_sync_3.pdfIn PDF document text
    • https://cdn.sqhk.co/konanetufuda/bpDhees/cover_orange_2_6-_15.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68B 5180 bytes
SHA-256: f1390b9c73b09e50422e1f0219fa230eb9694701ccf69e4b2507ac651c4d87bc
font_01_sfnt_off0001085e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085E 10696 bytes
SHA-256: 76b52164521b32b7cfba83a9ad574f0596f0db0c69ef81235dd02a67d4f6bfb7

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