Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fa184e78dd1b9c7…

MALICIOUS

PDF

78.4 KB Created: 2021-04-06 14:42:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 5d36adb063b5b9b2c93e463d7ba032d8 SHA-1: 54718f0888bd873fd5322ec6103145b962855639 SHA-256: 8fa184e78dd1b9c7bfe2bc3731e68fa51fdc39c9e62d654e98963da3041a246b
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or exploit delivery mechanism. It contains a large number of embedded external links, suggesting a link farm or redirection strategy to lead users to malicious sites. The document body, though heavily obfuscated, contains keywords related to the embedded URLs, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dugedepap.ru/award?keyword=hinario+caboclo+guerreiro+vo+corrente+cifrado+pdf PDF link annotation
    • http://drawer.icu/vegan_ice_cream_vancouver_wa048r2.pdfIn PDF document text
    • http://bijepitujutix.sportsontheweb.net/awards_current_affairs_2020_19.pdfIn PDF document text
    • http://mastericy-chistoty.ru/full_metal_jacket_introentcz.pdfIn PDF document text
    • https://cdn.sqhk.co/difixoruze/Amfcvjb/mujipaluzejew.pdfIn PDF document text
    • http://calipshatngaccs1.xyz/liberation_theology_in_africa39ttp.pdfIn PDF document text
    • http://pajuwepubawip.sportsontheweb.net/59217842461.pdfIn PDF document text
    • http://mnclassis.org/ge_over_the_range_microwave_charcoal_filter_kit0wham.pdfIn PDF document text
    • https://cdn.sqhk.co/tekuligote/thgNCnD/prime_recharge_for_airtel_xstream.pdfIn PDF document text
    • http://fresh-ita.space/guide_cnil_bpilbfki.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/bd8f5bf7-f0d7-475b-ac83-8774e4453913/87306122385.pdfIn PDF document text
    • https://s3.amazonaws.com/wezukep/38558626578.pdfIn PDF document text
    • https://s3.amazonaws.com/faxaxos/bogue_sound_fishing_report.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/18086546227.pdfIn PDF document text
    • https://11fe2947-f393-4df3-905d-f9f3730e834a.filesusr.com/ugd/b1b16e_e2aa148769674fb2b247806e4c0227b7.pdf?index=trueIn PDF document text
    • https://314a97e4-cc7b-499c-a999-42b15fb65c39.filesusr.com/ugd/fa4a73_25a4bed306b548f581a23912bfc18608.pdf?index=trueIn PDF document text
    • https://1864c106-1a4f-4194-99fb-dabd5a0af450.filesusr.com/ugd/17b194_3e51f9a2645340d58c54703bd4293ccb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vogubivajavofu/baal_veer_345_video_mp4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06b6e99f-c393-4d69-96f8-2b3cbf1e70f0/the_life_changing_manga_of_tidying_up_download.pdfIn PDF document text
    • http://sovogezo.atwebpages.com/mepafezonexexovepal.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/bittorrent_italiano_gratis_softonic.pdfIn PDF document text
    • http://vobozezojip.onlinewebshop.net/careless_whisper_guitar_notes.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_off0000f10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10D 5308 bytes
SHA-256: 36389b5654fc82ef42ad9881d54aba66182c515341d686e36d952f7c198ba536
font_01_sfnt_off0001032e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032E 12888 bytes
SHA-256: 4b2b40464f74c4d02b0ca64b7bf50e2eb36f68baad9e084712951b7f5179448d

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