Malicious PDF — malware analysis report

Static analysis result for SHA-256 557034b2af09624f…

MALICIOUS

PDF

87.1 KB Created: 2021-03-14 04:15:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 741cbe768a3ded22d73e6f9f4e7c787f SHA-1: 3090095c3786526276287ee63402e559af9895a8 SHA-256: 557034b2af09624f28aa58d45a1761cfa5b7693a15a4c67f425fff83f636a160
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a PDF SEO link farm, suggesting a malicious intent to redirect users. ClamAV detection and ML classification strongly indicate this is a malicious PDF, likely a phishing or trojan delivery mechanism. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://ponafet.ru/award?keyword=gate+electronics+and+communication+book+pdf
    • https://cdn.sqhk.co/vazoguzo/RijKdop/walking_dead_season_finale_watch.pdf
    • https://cdn.sqhk.co/nomazotesi/EticCzC/telubet.pdf
    • https://cdn.sqhk.co/vunalogivefu/hdRrHhj/arya_ek_deewana_2_songs.pdf
    • https://cdn.sqhk.co/zoturisa/g0gghdp/nixisenavujegov.pdf
    • https://cdn.sqhk.co/vunebapenuj/gjpyjfQ/biwikiremired.pdf
    • https://cdn.sqhk.co/bigulikexupa/dhcAhdt/gartner_hype_cycle_2019.pdf
    • https://cdn.sqhk.co/sepovili/jfohcif/winky_lux_rainbow_lip_balm_canada.pdf
    • https://cdn.sqhk.co/gujowaxexag/wBYjgyU/dubai_police_cars_bugatti.pdf
    • https://cdn.sqhk.co/merabuvi/gjjjFg7/amazon_music_hd_review_audiophile.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/wuzalugiseto/87548531227.pdf
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_eda1bd6db55144bea1b0f61152c81454.pdf?index=true
    • https://uploads.strikinglycdn.com/files/28be8409-7f6a-47dd-9df7-616fac4fc658/ocr_a_level_chemistry_breadth_paper_2016.pdf
    • https://s3.amazonaws.com/jexijer/commercial_real_estate_salary_guide.pdf
    • https://s3.amazonaws.com/lonozote/java_tutorial_bangla_free.pdf
    • https://uploads.strikinglycdn.com/files/34fa2862-bd16-4ca4-b42e-0de257a12c15/10943862819.pdf
    • https://6376acfe-5884-4251-b3d5-19a03c044549.filesusr.com/ugd/de3d83_fb41780ee8664970a57a13ba30e5858d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7e78cfd6-dbea-4617-90df-8ad44f6c8051/the_game_plan_full_movie_in_hindi_online.pdf
    • https://1416a32c-f91c-4ec3-9c10-bfdf610c7df7.filesusr.com/ugd/76de1a_9aa89e11fd9b494caa96db7460613dcf.pdf?index=true
    • https://86a9da1b-0b57-4b35-a77a-523886b904cd.filesusr.com/ugd/0d9a50_f18686e830924162ac04e0c1a27e93c6.pdf?index=true
    • https://s3.amazonaws.com/zafirawit/volume_of_combined_rectangular_prism_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/5c43b4f0-75e8-4ba0-a9b8-2115148a276c/harry_potter_quiz_buzzfeed_character.pdf
    • https://a80c0318-1640-4d50-a016-df037fc402b9.filesusr.com/ugd/895bef_ddb540b22a824ec0897a60e251a51d99.pdf?index=true
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4ef.bin
ff43cab39856e6cb3059a5ceaee582a34a4083a3d099f8a1fd1b179d6306eab4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EF 5420 bytes
font_01_sfnt_off0001073c.bin
553f44a24531e1ef76a63e46f8367ddb96eaaa3b6080649428f56e324ad8fc48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1073C 10668 bytes
font_02_sfnt_off00012bbe.bin
d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBE 16060 bytes
font_03_sfnt_off00014056.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14056 4324 bytes

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