Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8cdaa46a6773fca…

MALICIOUS

PDF

90.3 KB Created: 2021-06-10 00:09:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b0b7ddc457dc09482c0955aa501e39ad SHA-1: e75f4b487df39ecdd6e645c562de5f6bb789c702 SHA-256: d8cdaa46a6773fcabc8db0420d206348846be38521389f9f4d0da6f3834b0966
156 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 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://allytemp.ru/pbw?utm_term=broken+xiphoid+process+symptoms PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4456982/normal_5fe4c6a3582df.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495391/normal_5ff2f1a109771.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473642/normal_60501f627ad6c.pdfIn PDF document text
    • https://rurepatokuzi.weebly.com/uploads/1/3/1/6/131636758/wifanasenipes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417997/normal_6044d0f1eec61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459175/normal_6049c2346047f.pdfIn PDF document text
    • https://pipanemedu.weebly.com/uploads/1/3/7/5/137505834/zumitajanagun-luman-jugegukojireb-vobuku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459059/normal_5fcbd02b4538f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386089/normal_5fe48384e6ef5.pdfIn PDF document text
    • https://bidubemawekewar.weebly.com/uploads/1/3/0/8/130815124/pisubozuxazu.pdfIn PDF document text
    • https://sonikegusu.weebly.com/uploads/1/3/3/9/133997348/wotexeneboral-digipu-vasuvamofeki-gizifiki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367290/normal_6013cc0ed4b89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475852/normal_5fd10baa02ddf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450240/normal_5fecc4a120931.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415068/normal_5fe328131518b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tufukamapaf.pbworks.com/w/file/fetch/144872514/piwepeberelofuxemoxapi.pdfIn PDF document text
    • http://lerepaxa.pbworks.com/w/file/fetch/144841386/ejercicios_de_matematicas_suma_resta_multiplicacion_y_division_para_imprimir.pdfIn PDF document text
    • http://bajupuko.pbworks.com/w/file/fetch/144832020/ssat_middle_level_practice_test_ivy_global.pdfIn PDF document text
    • http://nibenaxibot.pbworks.com/f/download_the_song_tujhe_kitna_chahne_lage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d8611bc-fe5b-4da8-8aa0-15e0531140c8/how_to_switch_on_bluetooth_in_dell_laptop.pdfIn PDF document text
    • http://zubipuwaf.pbworks.com/f/what_is_the_main_role_of_warehouse_manager.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9508f8a4-3201-4399-b6b6-5e1ede9f4c7c/petilunejaxe.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_off000121ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121CA 5356 bytes
SHA-256: 1cec6dbd508decafc35c45d86e1645a08d9d87c8f76686fe7a1b89ec72b64647
font_01_sfnt_off000133e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E5 11068 bytes
SHA-256: 590ca4fd12e10237e1d884aa61a695376e48d146ee5d99a1c867217538a9a2d7

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