Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5eda2b650481cb1…

MALICIOUS

PDF

78.7 KB Created: 2021-03-21 12:06:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: bf95402274cc9f22f758aebfc0713a26 SHA-1: 5999ac309b4c758cc8fec784b23329650d763526 SHA-256: a5eda2b650481cb10ef64e5f6fe2e49454a66d26916456d16bd0ff494f192b8f
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://nipisod.ru/strik?utm_term=world+war+z+2019+video+game+metacritic PDF link annotation
    • https://vepimogarib.weebly.com/uploads/1/3/4/8/134856589/211390.pdfIn PDF document text
    • https://cdn.sqhk.co/miwavilusaji/cif8Rqh/juwojutimalusuwopa.pdfIn PDF document text
    • https://cdn.sqhk.co/kevekelobivo/2Sgjjhz/bubble_witch_3_saga_game.pdfIn PDF document text
    • https://cdn.sqhk.co/pumopivosoba/cKHF0b8/xuliwonige.pdfIn PDF document text
    • https://xovozenoz.weebly.com/uploads/1/3/4/3/134348708/35bcc4724ea8.pdfIn PDF document text
    • https://lirefabagobaxi.weebly.com/uploads/1/3/4/0/134012393/waxiridegoginezimoxa.pdfIn PDF document text
    • https://dubitofux.weebly.com/uploads/1/3/4/4/134458445/biduwe.pdfIn PDF document text
    • https://cdn.sqhk.co/xegunorasu/ghgLpic/color_piano_ball_jump_and_hit.pdfIn PDF document text
    • https://ramemegu.weebly.com/uploads/1/3/1/3/131383760/detekes-zapumilomenoga-gutajafujasaw-vorajew.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/575edb60-f8ba-4296-a2ca-25d9fe5254ec/gurukiwukebujimu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86414167-3941-45f2-ab0d-31c8c52fdff5/brookstone_floating_message_alarm_clock_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/visual_studio_2015_hotkeys_cheat_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/taiwan_vpn_pro_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bb4aa73-036d-4ba9-a607-f20cf0653a47/angela_carter_the_bloody_chamber_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/sixolose/pilulasoruligasifumu.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/haynes_repair_manual_1996_ford_ranger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f84131fb-72b9-4cf2-a199-1dc2bcb9275c/78867290589.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e41565f5-39e7-45f4-94f9-ed50f119311e/38479819939.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e699f1c-bd6e-4cf5-a401-574d9d2f4c36/lixitategonabev.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/98663797698.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_off0000f719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF719 5780 bytes
SHA-256: cf6bf3337043b0e19c190a99076b76cf95340de0f130b600791fd4be67c61487
font_01_sfnt_off00010add.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADD 10224 bytes
SHA-256: e04d56249cce9307c2c56e5e770b82106051c7598ad2979cc54ad6683bdf03c9

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