Malicious PDF — malware analysis report

Static analysis result for SHA-256 190242873006fc88…

MALICIOUS

PDF

68.8 KB Created: 2020-11-25 09:54:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 786d7de0a0dd78f343139fe5c3695ce3 SHA-1: c1f7589567d723408bdcc3ba941e0d9c0167be4e SHA-256: 190242873006fc8867cc77bb84746b8256c9d2801359b24bf4bae7ad272910d9
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many pointing to SEO-optimized PDF hosting sites, a common tactic for distributing malicious content. One prominent link, 'https://traffnew.ru/123?utm_term=reading+level+in+microsoft+word+2010', appears to be an SEO redirector designed to lure users with a seemingly relevant topic. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffnew.ru/123?utm_term=reading+level+in+microsoft+word+2010 PDF link annotation
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/nelumoxuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370270/normal_5f8f3a1d70247.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384459/normal_5f91edf803070.pdfIn PDF document text
    • https://jalewigevat.weebly.com/uploads/1/3/2/6/132681207/4a0e2130.pdfIn PDF document text
    • https://xawuwotogot.weebly.com/uploads/1/3/2/6/132695388/nibirixuvigezux_wuzigu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446390/normal_5fbb8a43cf976.pdfIn PDF document text
    • https://rogidalot.weebly.com/uploads/1/3/1/6/131636841/suloz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455180/normal_5fb349bc11a6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446773/normal_5fa438ae43799.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/nupotukig/xosevojasat.pdfIn PDF document text
    • https://s3.amazonaws.com/bitizopovopaso/88592862950.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/mosfet_switching_circuit.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/dnd_5e_dragonborn_height_weight.pdfIn PDF document text
    • https://s3.amazonaws.com/ruletetunima/phoneme_segmentation_fluency_practice_sheet.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

Related samples 2

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC160 5616 bytes
SHA-256: 311ab3a46e6268b73f42d79316b4b8ef07e9ade55741735e6e7beddf189649a2
font_01_sfnt_off0000d475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD475 10580 bytes
SHA-256: acb3ca27d28dee09d16b74adb97824196a51218a810f029d6e94e1deeebe85da
font_02_sfnt_off0000f81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81A 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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