Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a5ecbf4c7fecca2…

MALICIOUS

PDF

84.4 KB Created: 2021-03-19 01:37:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0ec91908a45cc6966f41173eeef8281b SHA-1: 5df12306a4b53d81ad89c02ccdc3872408140be6 SHA-256: 4a5ecbf4c7fecca2aa391dbd812a5825e137e907baef49a9891663f7741a7bbe
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9950

Heuristics 5

  • 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 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/wix?keyword=algebra+2+chapter+4+assessment+book+answers PDF link annotation
    • http://mnogoturov.com/29108308084kh138.pdfIn PDF document text
    • http://menbp.online/canon_powershot_sx720_hs_battery_charge_timet8lqu.pdfIn PDF document text
    • http://sozapemogoz.mygamesonline.org/43290803458.pdfIn PDF document text
    • https://cdn.sqhk.co/fewisezux/nojfgim/bhagwa_rang_video_song_hdvd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415326/normal_6012e0bb34233.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374536/normal_602a53da55f70.pdfIn PDF document text
    • http://beautysale.site/romeo_and_juliet_summary_act_1_scene_4tui2p.pdfIn PDF document text
    • https://cdn.sqhk.co/fidumugovoz/bhedhcT/bass_pro_shops_hatchet.pdfIn PDF document text
    • http://kogefidol.iblogger.org/bacterial_artificial_chromosome_vector.pdfIn PDF document text
    • https://cdn.sqhk.co/govamopega/hcciohg/kalepiloxenumegugonekitow.pdfIn PDF document text
    • http://nazawate.iblogger.org/98116112514.pdfIn PDF document text
    • http://golomashvanna.xyz/can_you_jumpstart_a_car_with_a_priushcrxs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460263/normal_6003527f40875.pdfIn PDF document text
    • http://fetesitomer.mygamesonline.org/how_to_use_igora_color_10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470402/normal_6022d79c64a6d.pdfIn PDF document text
    • http://talkme-news.info/didajarupanupeloh693.pdfIn PDF document text
    • http://runolive.com/badezasivozisuxu83hme.pdfIn PDF document text
    • http://vereffka.xyz/onkyo_tx-nr636_firmware_update4ztll.pdfIn PDF document text
    • http://guitar.su/rock_choir_music_sheetft103.pdfIn PDF document text
    • http://avbox.org/rafutupirutajoyhjwv.pdfIn PDF document text
    • https://cdn.sqhk.co/teketerep/JhALjai/24600494522.pdfIn PDF document text
    • https://cdn.sqhk.co/fivodewile/iLzbgjy/lefomukosurejenonak.pdfIn PDF document text
    • http://lumacy.site/50622947333zbwhp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://donopopasuxek.epizy.com/what_is_the_due_date_for_1096.pdfIn PDF document text
    • http://xeroxuzowi.epizy.com/50583735762.pdfIn PDF document text
    • http://xumuritikoxuk.myartsonline.com/bonezobakotisasew.pdfIn PDF document text
    • http://wekumut.epizy.com/16081665097.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5F 4220 bytes
SHA-256: 5ab3e5217174aa7f19042ce2806a4ecf6ad33bade95126bb9168557ef875ed21
font_01_sfnt_off00010744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10744 5852 bytes
SHA-256: 60bbe95a350044eafbade3314cfb750b677fdde43d41026a31546cc60cf97670
font_02_sfnt_off00011b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B20 11872 bytes
SHA-256: 74dabd4bb423a10cde96156d3424b809ad2456b944ca3c4a53c3f4994a631cdd

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