Malicious PDF — malware analysis report

Static analysis result for SHA-256 57b4c8397ae2f146…

MALICIOUS

PDF

84.6 KB Created: 2021-03-22 06:35:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: c31a2131495e76459d2a2f44f9282a6d SHA-1: b4db5758d7d740b298a89785de0ff0474d79df75 SHA-256: 57b4c8397ae2f1467887518085f08dd24036361ccccb4e77385409a39b454342
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a heuristic firing indicating it's a lure linking to an SEO redirector, identified as a free-download phishing attempt. The primary IOC is the redirector URL, which likely leads to a malicious site. Although no scripts were extracted, the PDF structure and heuristic firings strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/strik?utm_term=what+is+the+si+unit+of+radiation+measurement+for+an+absorbed+dose PDF link annotation
    • https://waxukazo.weebly.com/uploads/1/3/1/0/131071095/097d6d7f85.pdfIn PDF document text
    • http://pss77.ru/nikon_coolpix_s9700_user_manualtteew.pdfIn PDF document text
    • https://puxibaso.weebly.com/uploads/1/3/0/9/130968956/puwepoxitob.pdfIn PDF document text
    • https://wifivufadabigo.weebly.com/uploads/1/3/4/5/134522009/kaxagigafumofon-fawez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383800/normal_5fd1ad9794fc1.pdfIn PDF document text
    • http://choosenews.space/77976348192z0vwt.pdfIn PDF document text
    • https://lifefoxametuzov.weebly.com/uploads/1/3/1/3/131383893/pelulezalidagojezas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472491/normal_5fc996dba1230.pdfIn PDF document text
    • https://xijaxerunoseme.weebly.com/uploads/1/3/4/3/134306079/maxopepojiwozor.pdfIn PDF document text
    • http://laxana.ru/arduino_uno_programming_codes_listglz4m.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/93528564-3a35-4526-aefe-df71f4ce5fd3/vipojawebanesedukuji.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/62487973473.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf313abe-e62a-4c0b-b881-d9c4945861bd/79685325029.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/calefon_universal_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/3874701866.pdfIn PDF document text
    • https://s3.amazonaws.com/wewiro/51437455110.pdfIn PDF document text
    • https://s3.amazonaws.com/savifin/lezoxixajob.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/xozavifakofa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1743c2c9-89fb-42b0-90ae-46fa83a35d7d/10_day_green_smoothie_cleanse_recipes_day_5.pdfIn PDF document text
    • https://s3.amazonaws.com/luropiw/snuggle_puppy_swing_instructions.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B3 5268 bytes
SHA-256: a73ddd32aae9fa72092ff5bb1f98959433ffaf3f720e929c3d8926c688b4bbd0
font_01_sfnt_off0001067c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067C 12028 bytes
SHA-256: f42a2bb3c4efda169936c6844851868c826b136123547a50e72569aa84639612
font_02_sfnt_off00012f80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F80 16088 bytes
SHA-256: db7fbbf9de91a58b1f442fb5144638bd60c591eea3385ab55df1717f98f39f2c

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