Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a5f67bac8c262d1…

MALICIOUS

PDF

82.6 KB Created: 2021-03-15 09:11:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1ad5c6553d90b9d4121aa1b7553f0208 SHA-1: cc8db570408f6cd5c704c359addbbf336eb54ec3 SHA-256: 4a5f67bac8c262d11b286195f45970df44669f0f4384ae0d2f41cd9181a9668b
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML and ClamAV, as malicious phishing content. It contains an embedded URL that redirects to a suspicious domain, likely serving as a lure for users to download further malicious content or provide sensitive information. The presence of embedded URLs and the nature of the detection suggest a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jumiwimov.ru/123?utm_term=the+lexical+approach+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393362/normal_601d237e64c7d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473637/normal_5ffc6d1bcff26.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388827/normal_5fcf65e61d4d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452837/normal_5feceaf6dd131.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495837/normal_5fc7e78924e86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366027/normal_60350a08827c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444371/normal_60255b219d2b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417422/normal_601d297e66954.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453556/normal_5fe8be3582b98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375352/normal_5fe9e08d78e4a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/feb9804e-954c-44f3-b674-d93100c8dc1a/xanufulibi.pdfIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/toxicity_acetone_chloroform.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afc05395-e5ea-4249-9fa2-5ffac7410aa4/html_and_css_projects_with_source_code_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabisura/shirt_template_size.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04a10d2a-7e57-489d-aa10-6fde2990cff4/los_nombres_de_dios_en_hebreo_y_sus_significados.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77669af6-0fc7-47ca-a588-89bf1743ef23/audiocodes_mp_114_fxo_gateway.pdfIn PDF document text
    • https://s3.amazonaws.com/likadojivivofu/user_manual_for_samsung_tv_remote.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/luxuvef.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/angry_birds_transformers_cartoon_full_movie.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_off000105ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CE 5080 bytes
SHA-256: ab054faecacc7322cb6f36a695a4f6dd5bba80dc74dfde56024965dc8f44ed23
font_01_sfnt_off0001171a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171A 11284 bytes
SHA-256: 5be1c152d0625c3ea9e904449c42b2e9450636d84d92b0cec52429d424c2b9ec

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