Malicious PDF — malware analysis report

Static analysis result for SHA-256 b378729be19ce1d1…

MALICIOUS

PDF

90.1 KB Created: 2021-02-26 13:27:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 8927ed708b598fed0b9f29a29f179036 SHA-1: d42bce73215a72386a703393bd88467b124d262b SHA-256: b378729be19ce1d14b0b597e588a7a5c380cad92f28f4e59a5f960239fdc7f4b
254 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many of which point to redirector infrastructure and SEO link farms, indicating a phishing or malware distribution attempt. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a link to 'https://crophysi.ru/wb?keyword=the%20mousetrap%20london%20closing', which is known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure itself is used to host and redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wb?keyword=the%20mousetrap%20london%20closing In PDF document text
    • https://dunogijejuj.weebly.com/uploads/1/3/0/8/130813547/1847632.pdfIn PDF document text
    • http://jamotovoxut.mywebcommunity.org/nasimajudotuw.pdfIn PDF document text
    • http://rubewox.sportsontheweb.net/81365637323.pdfIn PDF document text
    • https://doxizuzipoleri.weebly.com/uploads/1/3/5/3/135323895/3055726.pdfIn PDF document text
    • https://vejiledulibona.weebly.com/uploads/1/3/4/3/134318828/c87a884f9.pdfIn PDF document text
    • https://silagonamep.weebly.com/uploads/1/3/1/4/131452845/menerumivipe.pdfIn PDF document text
    • https://molisemopum.weebly.com/uploads/1/3/1/4/131437834/2502672.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481408/normal_60342ea98c6ef.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/podawakumepewez/debof.pdfIn PDF document text
    • https://s3.amazonaws.com/fuvidokibet/algebra_2_saxon_math_test_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/christmas_music_playlist.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/polaroid_photo_template_psd.pdfIn PDF document text
    • http://timodetunidup.epizy.com/zorekafexevokuvu.pdfIn PDF document text
    • http://zefifimagami.epizy.com/bixatokiraze.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/55367137251.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_off00011f5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5D 5436 bytes
SHA-256: 46d4e47a7e3cc435181c230a6f735e4d6bfc0b3034bc8a034aace6e67786f01e
font_01_sfnt_off000131ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131AD 12920 bytes
SHA-256: 30c66e55e118bb5e40152fb4ed7e158fc7c7aeef499b2752c011fbf705d1f615

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