Malicious PDF — malware analysis report

Static analysis result for SHA-256 876b70491d82ee22…

MALICIOUS

PDF

94.0 KB Created: 2021-01-26 02:32:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 8c5032f231b9c49cd35d4de77a2ca2ae SHA-1: c789534bbc2791aabeb3ed452f332c589b3b0f18 SHA-256: 876b70491d82ee22e560e207d763260ddd1cf28dc931dbcb531f5fc3fbcb858d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO manipulation attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the PDF heuristics point towards a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://trafffi.ru/123?utm_term=land+transportation+coloring+pages PDF link annotation
    • https://nokabukewodujam.weebly.com/uploads/1/3/0/9/130969525/kajazirexogit.pdfIn PDF document text
    • https://buzikapafopix.weebly.com/uploads/1/3/4/3/134375334/b7576.pdfIn PDF document text
    • https://cdn.sqhk.co/repudodo/jcWtvxw/field_goal_kicking_game_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/leluforeref/jhgewCz/connect_fltplan_go_to_fs2020.pdfIn PDF document text
    • https://degebemug.weebly.com/uploads/1/3/0/8/130814630/zugosifupisaj_medus_josaj_gizujibekipu.pdfIn PDF document text
    • https://batigagonu.weebly.com/uploads/1/3/4/7/134774980/179576.pdfIn PDF document text
    • https://cdn.sqhk.co/vivepovugeli/OHjijhY/friend_finder_on_facebook.pdfIn PDF document text
    • https://mokowevabib.weebly.com/uploads/1/3/0/7/130739664/mejilipumujojawa.pdfIn PDF document text
    • https://cdn.sqhk.co/fiziroluj/igyOZhb/best_lullaby_songs_for_babies_lyrics.pdfIn PDF document text
    • https://xamubamujizej.weebly.com/uploads/1/3/1/4/131483378/zigewinumazetoveg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/aaa_travel_guide_costa_rica.pdfIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/diduvilonugirejulexajevor.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/arumbagi_mottagi_poovagi_video_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/coppelia_mazurka_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/kumasala/kakuweruvuvila.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/buloz.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/wederonerowuvim.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/carriage_clock_platform_escapement_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/nero_usb_bootable_software.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_off00011538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11538 8136 bytes
SHA-256: 0332b6a08a71245902c520828de16ee4cfbe94697892f433cfbaa7352e7bda70
font_01_sfnt_off000130ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130FF 5184 bytes
SHA-256: 7d7eab59bfc2eb5df5aa446ed046dec4b816f0e996f0af99bae088466a77f49b
font_02_sfnt_off000142b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142B2 11556 bytes
SHA-256: 3ab6203d6e538149a9f392ddf57658948ce0f4de8391161894553d0640bc6d4b

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