Malicious PDF — malware analysis report

Static analysis result for SHA-256 68f7c7bf2ae15e3f…

MALICIOUS

PDF

73.2 KB Created: 2021-04-20 01:23:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 914e2727742c615c3e8d7b06d32bac57 SHA-1: a91f80b9d9e0ffb617ab183c5d5a443e4b4eb303 SHA-256: 68f7c7bf2ae15e3ffbcc67dc8552fba53199fd4b1359631fea454488559415db
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards the use of JavaScript for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jottigo.ru/strik?utm_term=brother+typewriter+ribbon+ax10 PDF link annotation
    • http://re-capital.ru/how_do_u_share_a_video_from_facebook_to_whatsappl9o4k.pdfIn PDF document text
    • https://viwosakizipisot.weebly.com/uploads/1/3/5/3/135321869/leregu.pdfIn PDF document text
    • https://nolokevajazovap.weebly.com/uploads/1/3/4/8/134888215/memelugax.pdfIn PDF document text
    • http://cardioactiveuficiale.site/27827659853dvum0.pdfIn PDF document text
    • https://cdn.sqhk.co/jatizaru/jdCXZeQ/lejajegomafujiwejededug.pdfIn PDF document text
    • https://nopirepogoduk.weebly.com/uploads/1/3/4/0/134095858/4785247.pdfIn PDF document text
    • https://cdn.sqhk.co/vaminika/d4ahjhb/goal_won_the_football_manager_mod_apk.pdfIn PDF document text
    • http://sekodosara.22web.org/30460892112.pdfIn PDF document text
    • http://vawefisalob.22web.org/biochemistry_mbbs.pdfIn PDF document text
    • http://startbastar.online/zoketuvajofubjwz9.pdfIn PDF document text
    • https://cdn.sqhk.co/josipinu/HJgh8iW/delicious_cake_decorating_videos.pdfIn PDF document text
    • http://lasns.fun/how_to_close_a_polaroid_sun_600_camera_worthjj2u4.pdfIn PDF document text
    • http://gufutaca1.xyz/today_is_a_good_day_gifb78u5.pdfIn PDF document text
    • https://cdn.sqhk.co/sevimifogu/SUejc66/kinimumugaruluposipu.pdfIn PDF document text
    • http://bathforlegs.xyz/86389919821qp1rr.pdfIn PDF document text
    • http://reduslim-eu.site/chess_checkers_house_visitor_centerajhrg.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://b2bd4247-5771-4f9a-9f3f-b46500bff287.filesusr.com/ugd/f41bfe_357abf7dac174b6281862baa86b7ac9c.pdf?index=trueIn PDF document text
    • https://5a1138df-423b-4a5d-a7c7-36223740754e.filesusr.com/ugd/a72fa8_fa78ed54eb5b4b7cb303459ec34b8d73.pdf?index=trueIn PDF document text
    • http://robefopatobut.epizy.com/application_letter_sample_format.pdfIn PDF document text
    • https://8ed6bd9f-de2b-4923-b7df-82f95eb18a03.filesusr.com/ugd/7fa32f_7aa60a30bdd14677b78108aaf284cb66.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD540 5132 bytes
SHA-256: a9ee291a666740819813dd52c9d9192c8f9b3fd78630e91070898b71d42ede84
font_01_sfnt_off0000e6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BE 10132 bytes
SHA-256: d8a94c366735db80d955b5a4c19210a22eb48b6479c92f5293f8ee5371d7fb39
font_02_sfnt_off0001095f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095F 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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