Malicious PDF — malware analysis report

Static analysis result for SHA-256 d31cd4f50a917259…

MALICIOUS

PDF

76.4 KB Created: 2021-06-06 22:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 5ca463385192b33c2cce5176da4290e6 SHA-1: 50c9708a3083b48dc39f3b38e8df1ed076af86d8 SHA-256: d31cd4f50a917259d6e4fcc5c10ba42422453dba2224345a6f7f2ed81da0aee3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://medvor.ru/pbw?utm_term=jimmy+buffett+margarita+maker+recipes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4423454/normal_60689aa676be1.pdfIn PDF document text
    • https://fajorisovobune.weebly.com/uploads/1/3/4/7/134752278/007286c79a56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374360/normal_60490c33abe41.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426822/normal_6004b490cf2dc.pdfIn PDF document text
    • https://dowawanezezezo.weebly.com/uploads/1/3/1/0/131070762/3287546.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4385207/normal_60b4c947d0e3a.pdfIn PDF document text
    • https://selimubujupaso.weebly.com/uploads/1/3/4/8/134847774/viropexedoxoje-xifusugile-simegapiboniro.pdfIn PDF document text
    • https://pofofeteb.weebly.com/uploads/1/3/2/6/132681268/mozuvis-dorepov-fexit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418368/normal_60436f79cb324.pdfIn PDF document text
    • https://filavemegu.weebly.com/uploads/1/3/4/8/134883773/983a16a4ed47452.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xuruzinijub.pbworks.com/f/valores_normales_de_amilasa_y_lipasa_serica.pdfIn PDF document text
    • http://tujelupirobe.pbworks.com/f/kupexasozu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2c4c3c8-fd30-44c6-88d3-b436751e1608/fekugikelepi.pdfIn PDF document text
    • http://lakebimutep.pbworks.com/f/92457652540.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9101b238-d967-4da3-ba09-703e5dcbb29f/nituzaze.pdfIn PDF document text
    • http://kiletejude.pbworks.com/w/file/fetch/144411600/the_ph_miracle.pdfIn PDF document text
    • http://lomexalipele.pbworks.com/f/toy_story_3_game_download_for_ppsspp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0891849-c573-4aa9-a25b-0a4d4b75c614/gupefo.pdfIn PDF document text
    • http://sofutikajen.pbworks.com/f/how_to_calculate_critical_ratio_in_statistics.pdfIn PDF document text
    • http://damopijos.pbworks.com/f/dianetics_gratis.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_off0000eae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE3 5596 bytes
SHA-256: c7d05bb434b7e4a004cf4cbdc801de442370503f8fbbd89f6985473785627235
font_01_sfnt_off0000fdec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEC 11404 bytes
SHA-256: 2a6885bf51ddfd60ecad2e473791b56d205a720c724be366a8f9b977f860f133

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