Malicious PDF — malware analysis report

Static analysis result for SHA-256 19a488bb86a5906e…

MALICIOUS

PDF

71.3 KB Created: 2021-06-12 11:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e34f9c22ea241e9be420a5d3086ae6e3 SHA-1: c04c8910f739c7d16b3528b483773001bd403b8f SHA-256: 19a488bb86a5906e5a720ad3a320e478f8b2a8d1455428a93a13256fc66e44d7
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://nomylo.ru/pbw?utm_term=human+pedigrees+worksheet+answer+key PDF link annotation
    • https://suvoneretalepa.weebly.com/uploads/1/3/5/2/135299969/fde7a0f6b32.pdfIn PDF document text
    • https://jibunomo.weebly.com/uploads/1/3/5/3/135348462/57c70078b34b601.pdfIn PDF document text
    • https://tagagenefesogi.weebly.com/uploads/1/3/4/8/134864131/xobub.pdfIn PDF document text
    • https://nugibunexediga.weebly.com/uploads/1/3/0/7/130740514/tutiko-genumulorerit-tejepisimulejuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412599/normal_604a8096dd685.pdfIn PDF document text
    • https://sutogeva.weebly.com/uploads/1/3/0/7/130739298/85862c37883b1.pdfIn PDF document text
    • https://tefimapotile.weebly.com/uploads/1/3/4/3/134351392/ripirepetepigi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417528/normal_604fcc6e45ac9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455898/normal_60055e41a6197.pdfIn PDF document text
    • https://xugatasota.weebly.com/uploads/1/3/4/6/134673622/1967660.pdfIn PDF document text
    • https://fenanasu.weebly.com/uploads/1/3/1/3/131384656/1311153.pdfIn PDF document text
    • https://tujowijide.weebly.com/uploads/1/3/0/9/130969571/8264527.pdfIn PDF document text
    • https://nifusesoporiw.weebly.com/uploads/1/3/5/3/135309858/ce23d8.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/1d9fd675-fbe3-49fe-834f-7b320810f99f/creative_sound_blaster_x_fi_go_pro_drivers_download.pdfIn PDF document text
    • http://xeninexiruvo.pbworks.com/f/fun_activities_for_6th_graders_printable.pdfIn PDF document text
    • http://tefesabiji.pbworks.com/w/file/fetch/144802230/78295780177.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0399502-22c6-4e17-aa29-46eb2cc3bb32/how_to_install_smoke_detector_battery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd722d78-cf34-4bed-bc48-9a798dd4cade/upgrading_and_repairing_pcs_book.pdfIn PDF document text
    • http://sekodegaxex.pbworks.com/w/file/fetch/144600822/tegowusijenojetaxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/896120a5-c1e9-4014-b2de-9e957c789d34/82720002980.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_off0000d7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DD 5560 bytes
SHA-256: c156f5804cbbb04a602bf98a2f01457ae626056e5d53315b483d83fc77451809
font_01_sfnt_off0000eaaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAF 10972 bytes
SHA-256: ca092cbcf487baf27569089dc46c26aa5ec339d06ae5d4d7670960c3f117d478

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