Malicious PDF — malware analysis report

Static analysis result for SHA-256 9acba551eb4319b1…

MALICIOUS

PDF

75.0 KB Created: 2021-03-26 19:40:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e9b48e51d6159d7e7d0c114cd6b5e6e SHA-1: bee2341429ecbad09329a0ccc5f041a30a1377f6 SHA-256: 9acba551eb4319b1b1b30cea5bb2ecd459391f1632bd6443e9042d3d60ba6438
196 Risk Score

Malware Insights

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

The sample is a PDF document that contains a large number of external links, many of which are algorithmically generated and point to other PDF files. This behavior is indicative of a link farm or SEO poisoning attack, likely intended to direct users to malicious content or phishing sites. The ClamAV detection and ML classifier strongly suggest malicious intent, and the presence of numerous external URLs supports the attack pattern of luring users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://druttle.ru/wix?keyword=the+complete+guide+to+aromatherapy+third+edition
    • https://cdn.sqhk.co/gilubibawi/hd2gfhh/state_parks_with_cabins_near_jackson_ms.pdf
    • http://medgaj.com/99071633680y3jrg.pdf
    • https://cdn.sqhk.co/xiponamoribo/1shiidC/lilosomagagunuterowopowit.pdf
    • https://cdn.sqhk.co/tadawatimi/g4hbijs/lover.pdf
    • http://tegor.xyz/zmdi_icons_cheat_sheetfznnw.pdf
    • http://craftsmansmetics.com/panasonic_genius_sensor_1250w_microwave_partswikmq.pdf
    • https://pebepatesova.weebly.com/uploads/1/3/4/4/134447190/woxegodevajur.pdf
    • http://shortsomfj.space/walt_whitman_high_school_calendarkbnuu.pdf
    • https://cdn.sqhk.co/peferitukofa/chhgdQZ/yellow_and_grey_world_map_canvas.pdf
    • https://cdn.sqhk.co/zurefaxenov/idxjjge/kingdom_builders_international_ministries_lancaster_ca.pdf
    • https://cdn.sqhk.co/nawiwola/ggqghif/dora_and_friends_into_the_city.pdf
    • http://philonio.online/46809591181hjtml.pdf
    • https://kiparefewegapip.weebly.com/uploads/1/3/2/6/132682538/tenaloliwivot.pdf
    • https://cdn.sqhk.co/tokexinolelu/gfib5gf/contribution_margin_income_statement_excel_template.pdf
    • http://privateguardingserviceagainstdanger.site/tefuwemugifumenixezuxugekwo5u.pdf
    • http://burrrhey.tech/ruvesojapimel7k7s.pdf
    • https://cdn.sqhk.co/remowiwa/Ujfhht4/tie_dye_kit_near_me_target.pdf
    • https://cdn.sqhk.co/xipitufekaru/NUig3jh/94985384679.pdf
    • https://cdn.sqhk.co/wexapitode/NhhF1ja/graphic_design_app_for_beginners_free.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000e586.bin
97a578251defbcf106c20b5e60cc09881207e094caee3dfa8cba1ce4b37f3e51		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE586 5360 bytes
font_01_sfnt_off0000f79d.bin
b8c90cadf2862eca53532874f32c48be4a79690b4132b2992970b431980a0693		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF79D 10752 bytes

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