Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b1d629f31a6e441…

MALICIOUS

PDF

79.5 KB Created: 2021-04-29 22:24:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: f1f361f736d34b834aca62bd55607ea2 SHA-1: b6872bfa966a626f99bbb0f57e987dcfaa3c8d10 SHA-256: 6b1d629f31a6e44192d302a22041cbb727b8b65ca9a003453e8d18897d4d885f
134 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically identified as a potential phishing lure related to 'texas cdl tank endorsement test'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, and the 'ML_NYX_PDF_MALICIOUS' and 'ClamAV: Pdf.Phishing.Trojan' detections strongly suggest malicious intent. The presence of embedded URLs and the 'SE_DOWNLOAD_BUTTON' heuristic further support a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://resalured.ru/strik?utm_term=texas+cdl+tank+endorsement+test PDF link annotation
    • https://cdn.sqhk.co/kogujipubap/djtghhf/92140869842.pdfIn PDF document text
    • https://cdn.sqhk.co/falupuvevore/ijjd5gh/parrot_fish_bubble.pdfIn PDF document text
    • http://jejevep.22web.org/99951416912.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369772/normal_5ffaeb097bce8.pdfIn PDF document text
    • http://rotixumuzu.22web.org/editable_2018_calendar_template.pdfIn PDF document text
    • https://cdn.sqhk.co/leburogutu/TnlJhqW/glow_hockey_2_player_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446174/normal_604db8bd3e2a1.pdfIn PDF document text
    • http://magic-world.site/litimavazexonutepaz7vxw.pdfIn PDF document text
    • http://sibamonowoli.22web.org/amore_e_psiche_neumann.pdfIn PDF document text
    • http://cookwellbakewell.com/7236328445011q33.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463272/normal_5feec041bd4a2.pdfIn PDF document text
    • http://shop-onlinediscount.xyz/french_to_english_translation_dictionary_free_downloadzesmi.pdfIn PDF document text
    • https://cdn.sqhk.co/jowoluguwoge/Ghdr6jb/wuzifateratabusidij.pdfIn PDF document text
    • http://mosquito.codes/duromax_xp4850eh_4850_watt_dual_fuel_portable_generatorck4li.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451752/normal_6057cb1971af2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383568/normal_60469e03448b5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wovedukevikov/bhojpuri_gana_video_hd_ing_ke_sath.pdfIn PDF document text
    • http://tixelupaninaber.rf.gd/cv_template_doc_file_free.pdfIn PDF document text
    • http://timavutiziv.epizy.com/candy_camera_app_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/abcd_2013_movie_300mb.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/necromancer_guide_dnd_5e.pdfIn PDF document text
    • http://dozosimiwotug.epizy.com/witojukizipiniliwoje.pdfIn PDF document text
    • https://s3.amazonaws.com/jevelel/crosley_turntable_cd_player.pdfIn 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_off0000f6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D9 5164 bytes
SHA-256: 9a67f190078f29c2544bf0726fc203d7e4cb2ae9fbd410edc1212019703bf864
font_01_sfnt_off00010853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10853 11260 bytes
SHA-256: dc148026a3da6f4973f18029e216bf75614dad0fe5bec35f35e2c5d43e720141

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