Malicious PDF — malware analysis report

Static analysis result for SHA-256 dab0b4799551116e…

MALICIOUS

PDF

79.7 KB Created: 2021-03-29 10:14:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: a810a38bb6601fff51f0f500e31e3c1b SHA-1: af7431b1175897e5516e3ced6190a697103ef8d9 SHA-256: dab0b4799551116ef227d1e5d669a38ca7d54e96d104e29e642ad79fe59db09c
66 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a high confidence ML classifier indicating maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to obscure malicious links within a large number of redirects. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to appear as a legitimate document. The presence of external URIs points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://jacksth.ru/award?keyword=cellule+vegetale+pdf PDF link annotation
    • https://cdn.sqhk.co/jipuxoxukul/aieS4Zh/90033708802.pdfIn PDF document text
    • http://odebayitrafikhizmeti.com/41280249948i5hvs.pdfIn PDF document text
    • http://chaptejvxz.fun/8271404961lbsju.pdfIn PDF document text
    • http://magnetfix.store/api_570_jobs_in_canadawjytn.pdfIn PDF document text
    • http://okrasote.info/which_moment_corresponds_to_the_maximum_potential_energy_of_the_system_chegg0jxj8.pdfIn PDF document text
    • https://cdn.sqhk.co/wakewafo/I0ibdUt/tezamevabumixit.pdfIn PDF document text
    • https://cdn.sqhk.co/fiwujumejuf/hhwgiEV/32514024308.pdfIn PDF document text
    • http://bonus332.site/dizajolomazonezuveznxfv3.pdfIn PDF document text
    • https://cdn.sqhk.co/fokatekox/XfifFdR/76980908303.pdfIn PDF document text
    • https://cdn.sqhk.co/zasokolof/sYhfNtN/giwanosedavidaweni.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gagutaxu.rf.gd/lederageridele.pdfIn PDF document text
    • https://bbf05351-1c49-455c-8ea8-df349977a4d5.filesusr.com/ugd/15c6d6_f3b8e0d47aab4c2db22eec0d44c81819.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/44083bd9-9eae-486c-855b-82b247c5d863/when_did_total_gym_come_out.pdfIn PDF document text
    • http://kubemumibesedu.epizy.com/10163078315.pdfIn PDF document text
    • https://55963656-6eb1-4b25-bcd5-bb835d65808b.filesusr.com/ugd/0064ae_48eee6d414154b339c69e37c0b021e67.pdf?index=trueIn PDF document text
    • http://savipifuza.rf.gd/ms_word_document_recovery_software_free_download.pdfIn PDF document text
    • https://3ea853e4-7f2b-4fb0-9229-b04907a1e321.filesusr.com/ugd/d94095_65b9e2c20070447a8ce38e45a7734390.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/51088f0d-a64a-47df-b951-155a8c805e91/how_to_use_rite_aid_wrist_blood_pressure_monitor.pdfIn PDF document text
    • http://nexogakaxeju.epizy.com/everstart_25a_smart_battery_charger_manual.pdfIn PDF document text
    • https://00c0516a-c822-4344-a779-6f74e039753d.filesusr.com/ugd/9e41f0_63b90d2a80b54f3ca58c3031ad834156.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF538 4900 bytes
SHA-256: b63f2c08b98416571426738bafad644a1b493fd8285de389e78dca907fbf8dfd
font_01_sfnt_off00010604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10604 13692 bytes
SHA-256: 4b6b7816279f14d9406184bb49163035d929e898655ed6fce6024a0fd8831c26

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