Malicious PDF — malware analysis report

Static analysis result for SHA-256 878d701044b9ac8a…

MALICIOUS

PDF

77.1 KB Created: 2021-03-15 22:07:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a16eb1ff6b0a78d8ec4cb5d9b2f8d9e SHA-1: 78d769ed759f1eda26a1c874c7b13d9349704fc4 SHA-256: 878d701044b9ac8a0c4850b420e28dd687ea7757a3c427ff1d45c0f486eb5df9
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many of which point to educational materials or similar topics, suggesting a link farm or SEO spam operation. The primary external URL points to a site that appears to be part of this link farm. No scripts were extracted, but the PDF structure and numerous external links are indicative of a phishing or spamming campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/award?keyword=preguntas+ser+bachiller+2020+pdf+resueltas
    • https://cdn.sqhk.co/fekigimuzib/6cL6Agj/physics_notes_for_class_9_free_download.pdf
    • https://cdn.sqhk.co/vitimosugu/bLiehjJ/download_rpg_fernz_gate_premium_mod_apk.pdf
    • http://katipef.medianewsonline.com/10308717913.pdf
    • https://cdn.sqhk.co/zanuvajebodu/jfhg5ih/kikkerland_make_your_own_music_box_song.pdf
    • http://rasudilikid.mywebcommunity.org/kifarupesatanad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/firudegix/7322983899.pdf
    • https://uploads.strikinglycdn.com/files/c7297669-5ddc-4185-ae7e-f5e6f78d6412/betrayal_at_house_on_the_hill_2nd_expansion.pdf
    • https://03aaa7dd-6608-466c-a68c-f41c59811c05.filesusr.com/ugd/ae15ca_48a09a3e7af64bcf96b4956684f8cd56.pdf?index=true
    • https://s3.amazonaws.com/tejuvonixag/the_rich_brother_tobias_wolff_quizlet.pdf
    • https://uploads.strikinglycdn.com/files/fef054b6-948e-4ad3-a5ef-6e5df77c381a/2020_amc_10a_answer_key.pdf
    • https://uploads.strikinglycdn.com/files/6ccdba1e-7e5d-4324-96e9-25bbf70627c0/kindle_model_d00901_will_not_turn_on.pdf
    • https://s3.amazonaws.com/lazolu/mac_os_x_10._7_5_update.pdf
    • https://uploads.strikinglycdn.com/files/181904a9-5281-4efc-902c-65060746f7e9/how_to_start_shoe_making_business_in_nigeria.pdf
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_1eed26c0b1224205b0c29feb622c1ad8.pdf?index=true
    • https://b5f169ef-6bcf-4d19-a24b-32bdc9dd7a5f.filesusr.com/ugd/2e79a6_87c67a3f8bb646cb83e7168598f1c645.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c048f879-d083-4176-aa8a-46fe3e4e75b5/to_the_woman_i_once_loved_quotes.pdf
    • https://s3.amazonaws.com/zesotat/lofagow.pdf
    • https://uploads.strikinglycdn.com/files/f397de6f-e886-4520-98e9-98ff835f9dd9/30024445648.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_off0000e884.bin
116389e48690e0963e300daca689213852d8416e71de9dfc71ffc230d0a311e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE884 5832 bytes
font_01_sfnt_off0000fc56.bin
55ce7dcc9ae11457d7c3fe0f975aec1f00c8aa5c6388052cd76ecfa65c9d443c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC56 12612 bytes

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