Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a061d5863debcb0…

MALICIOUS

PDF

76.0 KB Created: 2021-03-16 03:35:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07b6b6aa4130a6972a4acc500079e6a6 SHA-1: 1985d98cbaa9471dc266adb35167e3668a569d01 SHA-256: 7a061d5863debcb0811c8f5a9b90aa5323c81f3a1862db53e3cf124439ce8906
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan-like behavior. The document contains a large number of external links, suggesting a link farm or phishing attempt designed to redirect users to malicious websites. The primary malicious URL identified is https://ponafet.ru/strik, which is presented as a search result.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/strik?utm_term=what+are+the+three+main+types+of+writing+styles
    • http://putoseba.iblogger.org/fopasip.pdf
    • http://litemado.iblogger.org/how_to_connect_jbl_flip_4_speakers.pdf
    • http://botefin.medianewsonline.com/79982117199.pdf
    • http://kerutugizuxig.mygamesonline.org/34340585688.pdf
    • http://ninotekega.mygamesonline.org/dryer_not_getting_hot_whirlpool.pdf
    • http://motarojetox.sportsontheweb.net/lelefusajiwu.pdf
    • http://siwosupegejolop.medianewsonline.com/potafisorokuj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/14771a0e-7957-49c3-84a3-fd168fdab3e1/76742780577.pdf
    • https://627f215e-41ba-4aa4-9906-5f9f9d117739.filesusr.com/ugd/8ab72e_8bb830417ac24d3d800d3d6c49f9679f.pdf?index=true
    • https://2ea3657d-1c4c-40dd-8491-58aeeb8dc933.filesusr.com/ugd/18a85a_d12e79a7f42744168c1c05c5ae3a17d7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6c218d70-6e76-4058-88cb-4826831b4fa6/hd_aswc-1_instructions.pdf
    • https://s3.amazonaws.com/bevarolimesale/blessed_piano_sheet_music.pdf
    • https://s3.amazonaws.com/jedaxopopuko/arch_linux_vmware_image.pdf
    • http://wifudozakiteg.epizy.com/giferewabuvapodaxurikoje.pdf
    • http://fejozimi.epizy.com/79708887761.pdf
    • https://uploads.strikinglycdn.com/files/9ba50e2e-e2f9-4820-8f5b-f4982573091a/wholesale_car_dealer_business_plan.pdf
    • https://f635e5d9-31b1-4f19-b758-7a623be10181.filesusr.com/ugd/6cf0f5_9bdc19639637412aad368196fd82fdd8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f7ccb3d8-e43d-49b4-aeeb-29bc1a878ce2/beturunidipu.pdf
    • https://uploads.strikinglycdn.com/files/15b63137-cc1e-4c28-bbde-0f708c96a154/31445798088.pdf
    • https://uploads.strikinglycdn.com/files/b4ce3a05-b963-4c14-b52f-17ffd918cefa/irobot_880_battery.pdf
    • https://uploads.strikinglycdn.com/files/f07984ef-911b-4fc0-aa6f-2665c8a1bc34/pakonodubefakazova.pdf
    • https://30d6ba4c-d201-4e26-8f31-a0e059b28788.filesusr.com/ugd/f9b8bb_4c2554964b8e4825a9f734f45b8ff44a.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaa9.bin
b045667e7076742a022b6740fdcb56a4f104ef15c68d5aa4384d7a472b3ade27		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA9 5520 bytes
font_01_sfnt_off0000fd68.bin
4b233fc2182f18297448b90ebde61ce00eb1c9a65256ec3f0cb4f9d1179ca74b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD68 10372 bytes

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