Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b7d85be110f9c6e…

MALICIOUS

PDF

76.9 KB Created: 2021-03-14 14:47:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c68aae3d2f8299d81e45f301e52c570b SHA-1: 76d1dc3a3621bac1cfe1f6d1504519782e2eb706 SHA-256: 5b7d85be110f9c6ef3e0875a774e9a705d64c5fc04c6b80e65cdc0fb8caae7ab
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, flagged as a link farm, and is detected as a phishing trojan by ClamAV. The document body, though heavily obfuscated, suggests a lure related to free sheet music. The presence of embedded URLs and the link farm heuristic indicate an attempt to redirect the user to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/award?keyword=let+it+be+sheet+music+piano+free+pdf
    • https://cdn.sqhk.co/dosakupu/RkVBljd/dirt_bike_unchained_game.pdf
    • https://cdn.sqhk.co/zakolemafemo/cvu6iaU/reincarcare_cartela_telekom_din_strainatate.pdf
    • https://cdn.sqhk.co/dawezizupata/hebhgTV/75749720805.pdf
    • https://cdn.sqhk.co/juxerawabuf/jhojfhd/40019698102.pdf
    • https://cdn.sqhk.co/ripigopes/mgOjbhb/16914524559.pdf
    • https://cdn.sqhk.co/kinemefuwa/cgfgfih/pilivirelenedadav.pdf
    • https://cdn.sqhk.co/xevowuto/yhgt8ij/wejodegu.pdf
    • http://gulibej.22web.org/debakiporasugugu.pdf
    • https://cdn.sqhk.co/gobenebovi/c8ihBig/bus_rush_game_download_karna_hai.pdf
    • https://cdn.sqhk.co/nixibaraje/WShhXjf/tomunatelunosawivokijuwef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://giverez.epizy.com/nikon_prostaff_target_efr_3-9x40_ao_review.pdf
    • http://fanofajuduma.rf.gd/34153006719.pdf
    • https://uploads.strikinglycdn.com/files/5c3dedc9-2f1e-4bdf-9687-41b5cfe34b0c/juxuxazepelixedoxewan.pdf
    • https://6e37e838-c278-4d46-baa9-25b8497af200.filesusr.com/ugd/fbcb80_573b89df200a4203bbb75315645beab7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/eb611246-91ba-4e89-a26e-81f717403fa6/leadership_test_bank_gust.pdf
    • https://uploads.strikinglycdn.com/files/1eb8ed24-9103-4473-84e5-3c0c2da93d5a/fiwufedok.pdf
    • https://uploads.strikinglycdn.com/files/daa2b2d3-4e27-48c7-8c97-0855d6d9b169/are_pointers_friendly.pdf
    • https://uploads.strikinglycdn.com/files/16ab8574-86ad-4799-afb2-3fe19efc71e4/life_is_full_of_tears_quotes.pdf
    • https://uploads.strikinglycdn.com/files/f5fb190d-1f43-4b88-9b08-d495057510f4/boss_micro_br-80_alternative.pdf
    • https://uploads.strikinglycdn.com/files/4bc72480-2af9-45ba-99d8-44ad8c0aca77/1186274611.pdf
    • https://413f70bc-0247-4a04-a3fc-eabb14e2b93f.filesusr.com/ugd/f18ee6_3a3b4cddfa3c4ad98197d88efa04ded5.pdf?index=true
    • https://1261df91-4e32-40b2-8b8a-4050d3c54cbb.filesusr.com/ugd/df69c1_87ca09ab57d14260a8f7ed3e1e61acc4.pdf?index=true
    • https://fc06435f-e709-4c80-b59d-96fa470c1a13.filesusr.com/ugd/bdc04d_22e3a97028564b238bdabd9241c53e02.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9d33748c-b2bd-4da5-b79f-edc83dff25fb/87227227940.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_off0000eee3.bin
4fff34eb402e659e94a0cd32bd602e108049aa5fa9c678afd62ce26c92e185d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE3 5444 bytes
font_01_sfnt_off00010135.bin
4ab3590179212394a86c7ac036a1350093d295bf2c420670593836822b41b313		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10135 10704 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.