Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bbe2b121a3381fa…

MALICIOUS

PDF

81.9 KB Created: 2021-03-22 04:05:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9cf862a50bd6a5a6fcbec99e9ce080d3 SHA-1: 75666a9ab67783b00965a5460f7bb960805284ac SHA-256: 3bbe2b121a3381fadbd73f435f216c4bab0e5c759144a78d5aa843992fa0f42a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically targeting a search query for 'chemical equation word problems worksheet answers'. This suggests a link farm or SEO spam tactic designed to drive traffic to potentially malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://lozipotod.ru/wix?keyword=chemical+equation+word+problems+worksheet+answers
    • http://hargotel.xyz/6179160233238e4i.pdf
    • http://idealicaitalia-ufficiale.site/what_item_to_trade_for_boomerang_links_awakening3ilnm.pdf
    • http://koprovk.xyz/xbox_one_owners_manualepz7o.pdf
    • http://hackins.site/jawbone_up3_app_2019xih3c.pdf
    • http://kamini33.ru/56896960162sfcf6.pdf
    • http://znalomstvavip.site/haier_air_conditioner_portable_14000_btu7j3po.pdf
    • http://lnstagram-help-businesss.com/head_soccer_la_liga_game_onlinejrzkt.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lebejos/annexure_e_form_for_indian_passport.pdf
    • https://s3.amazonaws.com/votubukaxogilix/givebimilezuxipifutexu.pdf
    • https://4465b75e-e642-4f53-8c89-e22f0b9d4994.filesusr.com/ugd/ecd213_3b4b97e175594341ac28f3464f7ce465.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d679c7e7-4a3d-400c-a644-d33160d59706/boston_market_menu_prices_2020.pdf
    • http://jomajipikuxa.rf.gd/zareriluni.pdf
    • https://s3.amazonaws.com/mejobu/furumisi.pdf
    • http://tozibuxadotoba.epizy.com/59993176858.pdf
    • https://de461234-8179-4892-b46d-67dc01ae00af.filesusr.com/ugd/69bbc5_94459ce072c74af4b50f63d7d85b4378.pdf?index=true
    • https://00c0516a-c822-4344-a779-6f74e039753d.filesusr.com/ugd/9e41f0_5341f9b3d16b413c937baeb2be84e25d.pdf?index=true
    • https://s3.amazonaws.com/jugobimuraje/abdomen_agudo_quirurgico_pediatrico.pdf
    • https://uploads.strikinglycdn.com/files/feac277d-9b6b-4eee-bce1-1be378410fbb/formato_de_una_minuta_de_reunion_de_trabajo.pdf
    • https://uploads.strikinglycdn.com/files/2b22b281-f1f3-4a0d-97cb-ec6fb48f60c9/clasificacion_del_derecho_publico_y_privado.pdf
    • https://s3.amazonaws.com/kujapomib/arsenal_vs_frankfurt_bleacher_report.pdf
    • https://528a8416-53f4-4693-bcf0-540471887af1.filesusr.com/ugd/c3aa89_a155abec9e57410eacfc31f49990aa73.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4c31937f-3666-4955-a76b-dd5e185c2658/91702985978.pdf
    • 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_off00010096.bin
256976c2ff8116c1f2d182667eb5e6c56dedc35cc8b388f846f4efa18a3f5c2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10096 5640 bytes
font_01_sfnt_off0001139c.bin
efc04799396ad5df8e1d34c70c22eb1e840095a92706ad1c765f44464e613e3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1139C 11288 bytes

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