Malicious PDF — malware analysis report

Static analysis result for SHA-256 62a6a03dbd98b2a0…

MALICIOUS

PDF

81.1 KB Created: 2021-03-16 02:01:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: bc10831c719fa37e4de09dd92413bdcf SHA-1: 5917de71065f46eb32c49dec56864b014bbe5933 SHA-256: 62a6a03dbd98b2a02ac677a37320b94874241de7fe935923bcc6e6da4bf4cc87
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous external links, many of which point to SEO-optimized URLs designed to appear as legitimate services like software activation or package tracking. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, and 'PDF_SEO_UTM_REDIRECTOR_LINK' specifically flags a redirector used for free-download phishing. While no scripts were directly extracted, the presence of embedded URLs and the ML classifier's high confidence score suggest malicious intent, likely to redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://druttle.ru/wix?keyword=activation+authentication+code+sony+vegas+pro+13 PDF link annotation
    • https://cdn.sqhk.co/futevanu/hfo6fgc/capstone_logistics_track_my_order.pdfIn PDF document text
    • https://ramaxuvezida.weebly.com/uploads/1/3/4/3/134327775/baa9256f90.pdfIn PDF document text
    • https://cdn.sqhk.co/dedikunakudu/phgide7/datacamp_sklearn_cheat_sheet.pdfIn PDF document text
    • https://ziregorex.weebly.com/uploads/1/3/5/3/135351653/senatomofokar-fikik-tukevujopat.pdfIn PDF document text
    • http://sadinexiwa.mygamesonline.org/the_practice_of_adaptive_leadership.pdfIn PDF document text
    • https://sejoxamopizava.weebly.com/uploads/1/3/1/8/131858661/xitasadaxi.pdfIn PDF document text
    • http://xogosedo.iblogger.org/34107104982.pdfIn PDF document text
    • http://vibuluvizawo.66ghz.com/how_to_render_a_minecraft_world_in_blender.pdfIn PDF document text
    • http://meveteletav.22web.org/polubetatonodasevobesom.pdfIn PDF document text
    • https://tuxutumixebapi.weebly.com/uploads/1/3/1/4/131438514/jaxozelibakex.pdfIn PDF document text
    • https://matexofetuboso.weebly.com/uploads/1/3/1/4/131453592/364218.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/womirofop/manodotifukebagivuzefutit.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/43272411946.pdfIn PDF document text
    • https://s3.amazonaws.com/wupuxus/spaghetti_in_a_hot_dog_bun_discussion_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/47616019052.pdfIn PDF document text
    • http://seroritubofa.atwebpages.com/dinosopafasowigowi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10812969-73ed-4abc-b025-bc9419f2d68d/79273145664.pdfIn PDF document text
    • http://jopuzasoxu.rf.gd/53029584272.pdfIn PDF document text
    • https://s3.amazonaws.com/dazuxujepov/pedipazele.pdfIn PDF document text
    • http://zevusup.atwebpages.com/knowledge_representation_in_artificial_intelligence_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36e10e49-5b78-4500-8f38-9b050a44d906/62674529997.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_off0000fcfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFE 5672 bytes
SHA-256: 813a47cf2b803646bc52878ba19966b7771a0dd1251148e6131743ab36ffe36e
font_01_sfnt_off00011061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11061 11300 bytes
SHA-256: 40e5979bad88901f9a1eaa8504e5e8ad586630541fb06810c8c6867f4d18cf6b

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