Malicious PDF — malware analysis report

Static analysis result for SHA-256 047221f6fa80d19b…

MALICIOUS

PDF

52.5 KB Created: 2020-10-02 01:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 91dfc11093b0b4070d9ea059fdfdb1de SHA-1: e4549a42bfc078f6e7e688b325ba3241cca4a405 SHA-256: 047221f6fa80d19bf5fe1c3c8b003bb1faccaab3b0638eb5f55a9a24f1c06012
234 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ggtraff.ru/strik?keyword=spiderwick+chronicles+game+for+android In PDF document text
    • http://topotami.socialandcognitivelearningcenter.com/uploads/1/3/0/7/130740141/debatir.pdfIn PDF document text
    • http://minarenap.resoundingword.org/uploads/1/3/1/0/131070442/sasajurej-kudadevixop-pefavoja.pdfIn PDF document text
    • http://xaxugopoj.spi-mountvernon.org/uploads/1/3/1/0/131069759/kiposexokajud-jifatoronebu.pdfIn PDF document text
    • http://vajavire.raptureragdolls.com/uploads/1/3/1/0/131070872/gajagewor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/be757012-9e9b-4e7d-8457-0da5fb18c549/14061839076.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/972237ee-1d54-4165-ac07-d42cc16f8e7b/95137184903.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2e6ebdb-5bf4-46e4-8d7a-4d71b8c38b8e/5648891112.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1927/9263/files/africa_mapping_lab_challenge_3_answer_key.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/8897/4502/files/81949185898.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/7877/3653/files/actiontec_gt784wn_firmware_update.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15a70119-4e31-4f49-bf33-68e3151d5684/88929162971.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c33247a-1ed2-4fee-9953-88e0eedf3604/86049929777.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec382e21-71c7-4f82-b760-eb394962bb53/dowusizudebixo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c48472d4-7280-4870-b3fb-319d29ffdca4/67437419420.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/105d12a5-3e3e-46ae-b0c1-06eb2da7637c/62702236327.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000096b8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x96B8 24900 bytes
SHA-256: d176fa02bce20baf1461c52e1f61729db7060c5bdaa7219ed7d4f211dee03c68
font_00_sfnt_off00005fc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FC6 5828 bytes
SHA-256: 4a21a7dba71099dfe391412ee5f4266d7108889f3f2d8dc204addc190ee95f91
font_01_sfnt_off00007390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7390 10196 bytes
SHA-256: 1f8804a27b39acbcf3bef81e5dfe997a40a4dfa1839489c6f3a99dcfa8fbbf1d

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