Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbb07615b5b0cb44…

MALICIOUS

PDF

77.5 KB Created: 2021-03-23 19:03:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4442c2ffcb6130b977d4a72566568def SHA-1: ca8828cb12c1af63fc6e67b60bb2efa4ebf57387 SHA-256: fbb07615b5b0cb4435e5ce9db9ec96bade2697218e2e3f9fe1614742e9dc428c
196 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and lead to other PDFs, suggesting a link farm or phishing campaign. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further supports malicious intent. The embedded URLs, such as 'https://resalured.ru/award?keyword=texto+argumentativo+expositivo+pdf', are likely used to redirect users to malicious sites or download further payloads.

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
  • 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://resalured.ru/award?keyword=texto+argumentativo+expositivo+pdf PDF link annotation
    • https://cdn.sqhk.co/vonezositixi/gwgdjfQ/red_robin_delivery_uber_eats.pdfIn PDF document text
    • https://cdn.sqhk.co/rasetiwulipu/aja8jc5/mafirukila.pdfIn PDF document text
    • https://cdn.sqhk.co/jeporikate/hepWQwK/arcade_2002_old_games_for_ps4.pdfIn PDF document text
    • https://bexoxofimimiwox.weebly.com/uploads/1/3/0/7/130775405/3f6048da.pdfIn PDF document text
    • https://cdn.sqhk.co/zapusukajev/ggjhmhi/sony_home_memories_software.pdfIn PDF document text
    • https://cdn.sqhk.co/febenapox/3bAXqid/amsterdam_city_guide_archdaily.pdfIn PDF document text
    • https://livuwijonirib.weebly.com/uploads/1/3/4/7/134732661/2305385.pdfIn PDF document text
    • https://cdn.sqhk.co/nodujugebi/bghaCja/merge_shape_option_in_ppt_2010.pdfIn PDF document text
    • https://cdn.sqhk.co/vorebilifi/jkGEZVz/lee_brice_song_lyrics_boy.pdfIn PDF document text
    • https://cdn.sqhk.co/lilaxikixo/Fjjajap/adobe_illustrator_drawing_pad.pdfIn PDF document text
    • https://cdn.sqhk.co/fuxiwimemo/Thg0QNc/dasugomaxudorisopazoxupim.pdfIn PDF document text
    • https://cdn.sqhk.co/wirowanorax/jiaZdjd/mufixifum.pdfIn PDF document text
    • https://nexudusuje.weebly.com/uploads/1/3/0/7/130740550/zanuxoresa.pdfIn PDF document text
    • https://cdn.sqhk.co/xogudililavo/hfgiYIl/basowinevexaguxurawafoli.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wixepaniri.epizy.com/45856809232.pdfIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/american_pie_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/acrobat_reader_for_android_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/annie_leibovitz_masterclass_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/rejiner/lochinvar_boiler_tech_support.pdfIn PDF document text
    • http://wokamanegiwive.rf.gd/ropetizutarovanema.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_off0000ef43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF43 5408 bytes
SHA-256: 786f21d9ae69ff2e1adb38648bb53b7a88bd6becd6e347f974ca78e2dbad2b11
font_01_sfnt_off0001019e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019E 11584 bytes
SHA-256: 07063f4921b898dc3de21176894eafbee3147ec09debb63eed472d34f8ee2d98

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