Malicious PDF — malware analysis report

Static analysis result for SHA-256 d963d5fdb33434a2…

MALICIOUS

PDF

117.0 KB Created: 2021-05-25 09:30:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6dd56303ccff257cb11d1bc3b5727c1a SHA-1: c20e31dc8a18532f281ac2422790a098a065fa59 SHA-256: d963d5fdb33434a2918286f2154b8e7ed969365341f887d429715647d0b3ba0b
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are SEO-focused and redirect through a URL that appears to be a redirector for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to trick users into visiting a malicious site, likely for phishing or to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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/strik?utm_term=legislation+du+travail+ofppt+tsge+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403560/normal_60431b420f01e.pdfIn PDF document text
    • https://zajoxewamabovi.weebly.com/uploads/1/3/7/5/137503144/469025.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408864/normal_60281971b0956.pdfIn PDF document text
    • https://mijevofere.weebly.com/uploads/1/3/1/6/131606011/53d057f5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403946/normal_602660bd133f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369648/normal_5fd1963105524.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/geraromu/one_step_inequality_word_problems_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afad426a-3003-40e4-a967-4635ad6ef949/telugu_catholic_bible_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/subopukomanaw/torenaraje.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/xutazuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f091ea6-b532-482b-b72f-68c3ca8f20b3/shark_rotator_professional_lift-away_vacuum_with_hepa_filter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59debbb9-e067-44b4-ae2e-f85933f16f16/wuvebepusugukazabed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a735244-7a47-4997-b85c-264327d62172/fejasagenawigixekufenifoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae0325d3-e2f9-4e90-8689-dcbe4f78504b/how_to_reset_alcatel_phone_when_locked.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/le_verbe_etre_et_avoir_conjugaison.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00019287.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x19287 22228 bytes
SHA-256: 0e27cef354901dbcd4c71f271d0a1a1876b238da12812593578fc02dc23f0393
font_00_sfnt_off000154b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154B7 5092 bytes
SHA-256: b032dc4326ebfd8327072f1a689a72acfb0c7292bb93e38a69a3a24933f9cdc2
font_01_sfnt_off00016621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16621 13840 bytes
SHA-256: 4aae07daa486723f412eceb58c7c0bf615566e31f9cd294364de2ce44f631d71
font_03_sfnt_off0001b882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B882 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3