Malicious PDF — malware analysis report

Static analysis result for SHA-256 0458b885a344d4c8…

MALICIOUS

PDF

129.0 KB Created: 2021-03-17 15:32:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7130a503401ca440419c2843d7841361 SHA-1: 9fcede4db1e7911462bea6bff4d94308cc688130 SHA-256: 0458b885a344d4c8d7891e93639d3e749107096ea5e43f507bd0f08f43d5298c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://jacksth.ru/wix?keyword=reglas+del+baloncesto+pdf PDF link annotation
    • https://fiwozipuwawew.weebly.com/uploads/1/3/0/8/130814157/texudutexape_jetumumime_sitinewapafiba_nezidemesi.pdfIn PDF document text
    • https://mubikobilowopo.weebly.com/uploads/1/3/0/9/130969089/cb9601be7ce.pdfIn PDF document text
    • https://xiruzavaxukegaf.weebly.com/uploads/1/3/5/3/135324830/967a46e2342c0.pdfIn PDF document text
    • https://basavorulifa.weebly.com/uploads/1/3/4/8/134899730/kupos.pdfIn PDF document text
    • http://razvivatel.blog/dymo_labelwriter_4xl_labelling_machine_lw4xlvimg4.pdfIn PDF document text
    • http://nutusugeralinet.mypressonline.com/barcelona_underground_map.pdfIn PDF document text
    • https://sekorora.weebly.com/uploads/1/3/4/8/134856449/58a6678028.pdfIn PDF document text
    • https://gadofipod.weebly.com/uploads/1/3/6/0/136056298/rakob.pdfIn PDF document text
    • http://zdorovie-vashe-vse.xyz/multiply_out_the_brackets_and_simplify_calculator8lsl9.pdfIn PDF document text
    • http://dumubemajizukov.medianewsonline.com/noxasibesoxinuvelukizafu.pdfIn PDF document text
    • https://limulepaxot.weebly.com/uploads/1/3/1/3/131379958/xidivivowemujine.pdfIn PDF document text
    • https://tuwozuzoleza.weebly.com/uploads/1/3/4/5/134509843/449019.pdfIn PDF document text
    • https://wokopapun.weebly.com/uploads/1/3/5/3/135388848/pifijed_xopoxon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b6facb5-4133-4b4d-b0af-09309b1c615c/radulajarilikipe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9dee78f-6e91-450d-937b-c09203b3fb08/panijoxezu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae9b5ba1-5c8a-4e48-b9e1-2d7ff226714b/fitizunapodinirinuzibelog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e415b4be-f38d-4312-a5e0-86cac57d37e0/tazaniselewafibapiwonoj.pdfIn PDF document text
    • http://nununad.myartsonline.com/officejet_pro_8600_ink_cartridge_replacement.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_off0001ba52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA52 5372 bytes
SHA-256: 8896be878b236354ddcc2751b6928b5f5375c2fc8b30da03b3cf791ef37f1ccf
font_01_sfnt_off0001ccb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CCB0 13912 bytes
SHA-256: cc03f83dfe4158ef4ef18eaf4c5c9aa47a5948cec3ab8b9e0c330457cd9e137f

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