Malicious PDF — malware analysis report

Static analysis result for SHA-256 688f34f96caa82e3…

MALICIOUS

PDF

74.5 KB Created: 2020-12-30 02:09:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 896e458460b38a9057afb2fc79895602 SHA-1: edb40071fa95dfbc4f885c2fa53a4cd9f1768f99 SHA-256: 688f34f96caa82e3eb633239d64f8309fd292bca4742f215755da8ce4c7a4586
214 Risk Score

Malware Insights

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

This PDF file was detected as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The file contains a large number of embedded URLs, suggesting it is part of a link farm designed to drive traffic to potentially harmful sites. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing or trojan variant.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://ggtraff.ru/123?utm_term=glass+diode+identification
    • https://zimiduninu.weebly.com/uploads/1/3/1/6/131637103/loforesebamofikuv.pdf
    • https://cdn.sqhk.co/saseponirifa/7jgijN6/best_free_password_vault_app_for_android.pdf
    • https://cdn.sqhk.co/xelalizogim/hfBhikG/tutetewurune.pdf
    • https://cdn.sqhk.co/xanodujijefu/adCvjaW/lemane.pdf
    • https://cdn.sqhk.co/kuruwoke/ig0igoq/is_it_love_ryan_your_virtual_relationships.pdf
    • https://ruparowix.weebly.com/uploads/1/3/4/3/134350000/8536117.pdf
    • https://cdn.sqhk.co/likunubiba/cjcgchf/100_books_to_read_bucket_list.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e3ec91ba-c306-47fe-a54a-e2501070caa9/ima_formula_for_screw.pdf
    • https://s3.amazonaws.com/tejuvonixag/the_party_at_kitty_and_stud_s_trailers.pdf
    • https://uploads.strikinglycdn.com/files/619a5f84-2163-4131-a5f8-769ed2e62a36/batman_dark_victory_comic.pdf
    • https://s3.amazonaws.com/perurulexi/can_i_play_android_games_on_macbook.pdf
    • https://s3.amazonaws.com/zonebon/febamikubexi.pdf
    • https://uploads.strikinglycdn.com/files/b4a81e7d-e799-45f8-82de-a2393785e117/science_of_creature_design.pdf
    • https://uploads.strikinglycdn.com/files/f8a73e61-7e4f-4fef-9227-cc14d3a72443/balubagoxewi.pdf
    • https://uploads.strikinglycdn.com/files/9cb7746a-f16c-4a5e-982a-965a926daa5c/the_ghost_of_tom_joad_lyrics_analysis.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_off0000e7a1.bin
f488bbcf8f9256f9465c22094a1ad8713ad2ea7564bec4fb8f835e4e30af166e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A1 4952 bytes
font_01_sfnt_off0000f88f.bin
2a3d512d6678fef6f87879d2bd49acf04bcb8432f9809a26ccd1ae2245a6546b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF88F 10624 bytes

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