Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecfbd5c5ac8651d8…

MALICIOUS

PDF

89.8 KB Created: 2021-03-17 20:28:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: f80ad3979d4854d3d84cbe6d507af1bc SHA-1: 5c6a9158c3fe2b0edd52f602ff48d0333cb9d653 SHA-256: ecfbd5c5ac8651d84323a6a98b1cba346a19d052b100f9587f3c4c13b612992a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content, likely involving JavaScript execution within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/wix?keyword=379th+bomb+group+wwii PDF link annotation
    • https://teseresoj.weebly.com/uploads/1/3/4/6/134644138/8244376.pdfIn PDF document text
    • https://cdn.sqhk.co/sexuzoropa/heijibx/factor_v_leiden_pregnancy_guidelines.pdfIn PDF document text
    • http://janorewaxeno.mygamesonline.org/34220237971.pdfIn PDF document text
    • http://jigapenufi.medianewsonline.com/how_to_operate_kitchenaid_food_chopper.pdfIn PDF document text
    • https://miwuzuxatidako.weebly.com/uploads/1/3/0/7/130775980/d9fcdfbdbe5b41.pdfIn PDF document text
    • http://duwuzoruperiged.scienceontheweb.net/godidadon.pdfIn PDF document text
    • http://gugaferur.22web.org/brickleberry_season_1_full_episodes.pdfIn PDF document text
    • https://gopopozemilin.weebly.com/uploads/1/3/0/8/130874381/vanebopa.pdfIn PDF document text
    • https://cdn.sqhk.co/nufuwijili/KD7gc2v/bewepi.pdfIn PDF document text
    • http://gosepakaf.getenjoyment.net/magisterium_livro_4_download.pdfIn PDF document text
    • https://vexalujonesudu.weebly.com/uploads/1/3/4/7/134738084/pasoxejofupo.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwadezab/ehdgghj/89704044693.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/WPoPJsT/granny_mod_apk_hack.pdfIn PDF document text
    • https://tijawuxegolizad.weebly.com/uploads/1/3/4/5/134597381/nakibikigive-gotobimi-wusugamow-rugomewupi.pdfIn PDF document text
    • http://vegekezivujid.22web.org/63051665488.pdfIn PDF document text
    • https://cdn.sqhk.co/joxesinejag/igjgcie/samsung_tv_split_screen_problem.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://s3.amazonaws.com/jolozidabi/dragon_ball_z_gt_game_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/gedexim/how_to_resize_passport_photo_to_2x2.pdfIn PDF document text
    • https://s3.amazonaws.com/bagisi/56721003235.pdfIn PDF document text
    • http://tizexazebubo.atwebpages.com/32028238264.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/holy_quran_software.pdfIn PDF document text
    • https://s3.amazonaws.com/patilawasu/online_video_er_freeware.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11320 5008 bytes
SHA-256: 64816b07fc9afc01a5414f76dbd9b200b2ad32d93403e81a5c89737663b95c5c
font_01_sfnt_off00012439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12439 11840 bytes
SHA-256: 89fd88a2d373069fbb5633eb4234e71f04c833d1b7125e5ffe6a092e22e31547
font_02_sfnt_off00014b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B64 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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