Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4b8a9d245c0caa2…

MALICIOUS

PDF

85.7 KB Created: 2021-03-05 16:53:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 9ccb358679928994db5b30ceaf349063 SHA-1: a2350275bd279e562a2cce47ad66f12284a0b91f SHA-256: f4b8a9d245c0caa2faf6fae87bddf27949894ec97676d57223cf4d6c75e0c355
184 Risk Score

Malware Insights

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

The PDF contains embedded URLs, with one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains strings related to the 'Rosemount 5300 manual' and 'wkhtmltopdf', suggesting a lure to disguise the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/wix?keyword=rosemount+5300+manual In PDF document text
    • https://nabisafuv.weebly.com/uploads/1/3/1/4/131413222/9446938.pdfIn PDF document text
    • https://rugibabolunape.weebly.com/uploads/1/3/1/4/131454120/7760258.pdfIn PDF document text
    • https://pudeputuxokaj.weebly.com/uploads/1/3/5/9/135968230/wabuxakunudimakeg.pdfIn PDF document text
    • https://xodisukuzoki.weebly.com/uploads/1/3/5/3/135390210/joximexin_renuxavevu_jinefa_wemozejazapaj.pdfIn PDF document text
    • https://gesofomudejow.weebly.com/uploads/1/3/4/3/134344239/cf50b27b8bc0a8.pdfIn PDF document text
    • http://gabasikekapubul.iblogger.org/levabulaxepiw.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/rekawexuretowo/lanoxeluta.pdfIn PDF document text
    • http://kowisefofob.epizy.com/69337686412.pdfIn PDF document text
    • https://ced6af22-cf5f-4df0-9cd6-2d424634d287.filesusr.com/ugd/3eed2b_7608d6a76c764bdfba8f6a5c3ab305d8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/59131164-d68b-442e-bec0-e96446816a71/jetuxefug.pdfIn PDF document text
    • http://womutefipile.epizy.com/kathi_mela_kathi_song_lyrics_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fulazelof/75630126084.pdfIn PDF document text
    • https://26577e91-18e8-42c3-8e85-49dcca1d6605.filesusr.com/ugd/195787_efffb5ebc3fd45e4bb5006cab7010c58.pdf?index=trueIn PDF document text
    • http://pepererazi.rf.gd/how_to_look_up_drivers_license_status.pdfIn PDF document text
    • http://jojudodadanu.epizy.com/vudoribofakute.pdfIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/vehicle_tax_information_punjab.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/pufakofu.pdfIn PDF document text
    • https://badbb018-ab4e-499b-b788-960949b82e3d.filesusr.com/ugd/4f4c56_a6f61b8c19364048a083a859e1b1fc2a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e963b06-b181-4ce8-a27b-6d145773866f/how_to_get_product_code_for_origin_sims_4.pdfIn PDF document text
    • http://febiked.rf.gd/91820850896.pdfIn PDF document text
    • http://koraxirimaxodet.epizy.com/93259448414.pdfIn PDF document text
    • https://s3.amazonaws.com/kotenu/can_you_sue_a_judge_for_violating_my_constitutional_rights.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_off000113ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113ED 5172 bytes
SHA-256: 9d6dff153065d97729af4f0a818c12ff29cf806d8f73d21cc2928db52d179e38
font_01_sfnt_off0001257a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257A 10728 bytes
SHA-256: 60b21d7cf02e0801546f335a2d365e69f10d3737741a9f2c05fe1edff71bfde6

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