Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba87255e4c8af54c…

MALICIOUS

PDF

79.1 KB Created: 2021-03-04 21:32:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7a54b7bca048208105129cb710f06e4c SHA-1: 6b7e8e040f508f3920727a9e1fedcbc7968642b6 SHA-256: ba87255e4c8af54c1da4aba873dd0d357e5f4feaadc9f8abff7b3695dc834ddb
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to 'The Great Gatsby study guide answers', aiming to trick users into visiting these malicious sites.

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://pelibifir.ru/wix?keyword=the+great+gatsby+study+guide+answers+chapter+2 PDF link annotation
    • http://lelekelosutov.getenjoyment.net/go_to_market_plan_template_powerpoint_free.pdfIn PDF document text
    • http://drnextact.xyz/vunobibozuzumetidfd93f.pdfIn PDF document text
    • http://mekujoviwe.mypressonline.com/xosivano.pdfIn PDF document text
    • http://sosed.market/77855932662gge1w.pdfIn PDF document text
    • http://winoraama.website/75522068271rzlcq.pdfIn PDF document text
    • http://help-service-support.com/podadora_de_cesped_manual_colombiatf8tk.pdfIn PDF document text
    • http://fashion-deals.xyz/87541216625g2hvp.pdfIn PDF document text
    • http://mon-cmbretagne.best/muxewibufonea5rhk.pdfIn PDF document text
    • http://bluebadge-support.com/toastmaster_table_topics_tips2gra1.pdfIn PDF document text
    • http://mosuzovopij.22web.org/wow_classic_horde_mage_aoe_leveling_guide.pdfIn PDF document text
    • http://tijukilebag.getenjoyment.net/bissell_spotclean_proheat_portable_5207.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tiwobera.rf.gd/89421568069.pdfIn PDF document text
    • https://s3.amazonaws.com/voxazedisula/32855076932.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f3da263-e68a-4c00-b96e-aceddfc3fdf7/pulajaforexumesemelak.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/jepuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89a4cdfb-918e-4ae4-ae81-fadb8b080fd7/40873438057.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/242ee237-a6fa-4f3d-a8d6-ec79a1f76cd5/vegetarian_lunch_ideas_for_fussy_eaters.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/20625912442.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/26512043692.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/vovovufuzojirarumuwovoje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89b40fb2-32c0-4684-b968-9d4c4f7f8664/samsung_vrt_plus_washer_ur_code.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_off0000e8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FA 5720 bytes
SHA-256: 5df15d7561e1686dfb0b1d1d011a49c0db61dfc5ea7c972dc58402364fd65cb3
font_01_sfnt_off0000fc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC84 15564 bytes
SHA-256: 3113961f59bac25d581ba68f64eb60109af6c9317f96f74e2dada20dded2867e

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