Malicious PDF — malware analysis report

Static analysis result for SHA-256 affebb76cdcbfd79…

MALICIOUS

PDF

75.7 KB Created: 2021-03-09 20:32:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 90ca97735e41e44548e62acc0892d6ed SHA-1: 867d985d5bdbf31a676c4fbf5c2c71c809672e6b SHA-256: affebb76cdcbfd7951810ba2799c305e406a0344dc0a135928ab8f3c9a495022
186 Risk Score

Malware Insights

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

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 0.9997

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://xajibur.ru/award?keyword=introduction+to+geometrical+optics+milton+katz+pdf PDF link annotation
    • https://cdn.sqhk.co/pumibavi/UNNjdXW/19709718746.pdfIn PDF document text
    • https://cdn.sqhk.co/sifolilo/sOicVjg/wofizoxowobenolabenatanim.pdfIn PDF document text
    • http://gepexoliv.medianewsonline.com/how_deep_is_lake_worth.pdfIn PDF document text
    • https://cdn.sqhk.co/tobijoge/jLmid9H/naruto_x_boruto_ninja_voltage_latest_update.pdfIn PDF document text
    • https://cdn.sqhk.co/nemazuwigumo/iiihiky/40538452173.pdfIn PDF document text
    • http://bitalotava.scienceontheweb.net/mubakerosuted.pdfIn PDF document text
    • http://manamuposa.getenjoyment.net/11748436562.pdfIn PDF document text
    • https://cdn.sqhk.co/fusajovogi/wgeLtKy/steam_workshop_downloader_free.pdfIn PDF document text
    • https://cdn.sqhk.co/kavonalitego/diCjOha/77657241359.pdfIn PDF document text
    • https://cdn.sqhk.co/buzodafevuj/AnjdPge/28646069867.pdfIn PDF document text
    • https://cdn.sqhk.co/mumesimasozo/hfjehdS/orange_county_balloon_garland.pdfIn PDF document text
    • https://cdn.sqhk.co/lazemowul/s3Ssjbm/pedometer_step_counter_app_download.pdfIn PDF document text
    • http://zazorin.scienceontheweb.net/19496007446.pdfIn PDF document text
    • https://cdn.sqhk.co/bomumuxa/gVmhiD9/revenge_of_ninja_battleground_survival_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/4461287801.pdfIn PDF document text
    • https://52ed6390-a5c1-4502-9f93-599cf6d98ad1.filesusr.com/ugd/f7fbc8_b45a27db019c442a8caafc1cf09f0e5a.pdf?index=trueIn PDF document text
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_ffd05eb22ad24fee8d28465200472459.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xapota/rujakuro.pdfIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/2149537082.pdfIn PDF document text
    • https://0fdd9f25-8366-4660-9463-376fd915ad39.filesusr.com/ugd/c16cf9_45eb1a01265f4ef1ae28dc4bc1c0392a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dikomavomem/dewubagikug.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_off0000e907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE907 5528 bytes
SHA-256: 953f01a2a9abdd31fc48215aa3de57ee2a17c00913c2562e644bf78e66641f73
font_01_sfnt_off0000fbc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC5 10452 bytes
SHA-256: 2d6330321142f3d9066c8ab2c4608567c01a1722b3af1d727d330f213202a11f

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