Malicious PDF — malware analysis report

Static analysis result for SHA-256 e958a7373f593948…

MALICIOUS

PDF

66.6 KB Created: 2020-11-08 13:33:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: bb88a4b6ffad1795d3262fd3ad8a6dde SHA-1: a4e925dbd388ac82172fd27f2b71a000f17504a4 SHA-256: e958a7373f5939487d7ae0311d9de5700f96cb05f67d8ce1f0fdf52c7910cef1
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://trafffi.ru/aws?keyword=delta+green+pdf+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375503/normal_5f8e04ea31b79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365998/normal_5f87354ad8ffa.pdfIn PDF document text
    • https://gesojotumone.weebly.com/uploads/1/3/4/6/134614539/5411faaa.pdfIn PDF document text
    • https://xifobosakup.weebly.com/uploads/1/3/2/8/132815359/f3b9500db.pdfIn PDF document text
    • https://morurotefat.weebly.com/uploads/1/3/4/3/134317018/raxiv.pdfIn PDF document text
    • https://tadeperag.weebly.com/uploads/1/3/4/6/134605934/perijutezebake-dolepujerijab-xanenixuru.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/retobifulipo/julipatorodibof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d609f1b9-2743-4440-bcbf-8d74113e883d/37880132243.pdfIn PDF document text
    • https://nosajal.files.wordpress.com/2020/11/pretrito_imperfecto_de_subjuntivo_ejercicios.pdfIn PDF document text
    • https://dilopipo.files.wordpress.com/2020/11/demetivudaxakoleze.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/steven_universe_the_trial_part_1.pdfIn PDF document text
    • https://jepawik.files.wordpress.com/2020/11/22165285235.pdfIn PDF document text
    • https://s3.amazonaws.com/befevifa/76785371561.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/revameg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cabe24c4-a9ab-4d7a-8321-77572360529e/packet_tracer_5.1.4.4_answers.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_off0000cd06.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xCD06 27384 bytes
SHA-256: 162462ba21b3684eeae473f10731398a943cf1cdd4c7bd6e6754f4296ac3be26
font_00_sfnt_off0000952e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x952E 5028 bytes
SHA-256: bfd025f706f891d7fc74c223048c65ddeb38f2451b1c6d9d8ba815439490c5f4
font_01_sfnt_off0000a662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA662 11364 bytes
SHA-256: 45da7d91f83bdc797bc1389d70178c396120f07c6683834bd9beee4b9b64dcb3