Malicious PDF — malware analysis report

Static analysis result for SHA-256 815339259549f9e4…

MALICIOUS

PDF

46.7 KB Created: 2020-11-06 20:40:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: 7aafe36e3cfc11a9c4dacda731f7484b SHA-1: 078d08b1602ad3927890fc0690826d89aeb16beb SHA-256: 815339259549f9e42d06886be4c06fbad0ee2657d1b7c1dda9e61589fd931737
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/123?keyword=5+paragraph+argumentative+essay+outline+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369775/normal_5f87f53c5e2ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410214/normal_5f9501ef3a08e.pdfIn PDF document text
    • https://bofanowowedo.weebly.com/uploads/1/3/4/5/134506880/gefosela.pdfIn PDF document text
    • https://tibiwurab.weebly.com/uploads/1/3/2/6/132695994/leludef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369908/normal_5fa1699553f3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416502/normal_5f9e2092cf28a.pdfIn PDF document text
    • https://korodovijexud.weebly.com/uploads/1/3/4/5/134512412/vikadevitete-tavupukawuka.pdfIn PDF document text
    • https://pexulowiseguwuz.weebly.com/uploads/1/3/4/3/134391342/746409.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://sisiviweze.files.wordpress.com/2020/11/50939477702.pdfIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/lunopidibazefuxobekidig.pdfIn PDF document text
    • https://botebofeji.files.wordpress.com/2020/11/15963812645.pdfIn PDF document text
    • https://s3.amazonaws.com/fenatagazise/new_nintendo_3ds_xl_jailbreak.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/12304335971.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/41379275550.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/centroid_and_moment_of_inertia_of_common_shapes.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_off000078de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78DE 5648 bytes
SHA-256: a4fb5e32bb50ee44c2d2b62292bf4ef826386ffb7fdd1c3be4280dad87986211
font_01_sfnt_off00008bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BF5 9792 bytes
SHA-256: 1384d46f2e265af9d6f23acfa5eb9aee614f1d0406aea98c8c1ad6d652d6a57a