Malicious PDF — malware analysis report

Static analysis result for SHA-256 10305a6522990275…

MALICIOUS

PDF

45.6 KB Created: 2020-10-27 23:20:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 420b267e1e9961be5694786ef7f2d8da SHA-1: 898d56c19f791e8824bc0087da37b13c3b956992 SHA-256: 10305a6522990275658b7c8d29c914f040b182092fa4299f215907557fc0d9bf
194 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious URL, disguised with a seemingly legitimate search query. This is further supported by heuristics indicating a malicious redirector and a link farm, suggesting an attempt to drive traffic to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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/123?keyword=solid+principles+java+interview+questions In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365656/normal_5f885b75229a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375203/normal_5f8fab5a27b54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393029/normal_5f8f4b1b59776.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379377/normal_5f8b6bff7a7bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410459/normal_5f956ee8dc1c5.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/tidivobinimigip-banez-batipafon.pdfIn PDF document text
    • https://xemojunaxumig.weebly.com/uploads/1/3/4/2/134265853/5495311.pdfIn PDF document text
    • https://jugoruzaja.weebly.com/uploads/1/3/1/4/131407370/4647236.pdfIn PDF document text
    • https://xodetawutal.weebly.com/uploads/1/3/0/7/130774968/2144949.pdfIn PDF document text
    • https://tovozilulu.weebly.com/uploads/1/3/0/8/130873983/siwepe.pdfIn PDF document text
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/8532723.pdfIn PDF document text
    • https://zesopupejilit.weebly.com/uploads/1/3/0/7/130738861/c8a1498.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/setaxilitozuko/josejagi.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/genezomurujov.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/americo_castro_el_pensamiento_de_cervantes.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/gowemetuponebuzote.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/sociological_perspective_on_family.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/8392/6171/files/niseko_guided_ski_tours.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8b6b1a2-8993-46a6-810b-4ca0a644ed37/46663458493.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1da30b1b-55af-4c4a-8319-e25d90c8d423/57382155414.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9188c640-47da-4092-b614-6167f68e6992/92317669947.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efd31a0b-8df2-478b-8f94-d98df4e32707/24209124863.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59860144-8f80-4e21-90fa-18a538acf33d/list_of_positive_affirmations.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_off000070e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70E5 5524 bytes
SHA-256: ea2a342f8fb89f4be68d8907b7b0f21b4f8e043414538366093624c938d53b63
font_01_sfnt_off000083cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83CB 10956 bytes
SHA-256: 86ed563c741ea22d1af8cfaafc69603916fcc4ae7b0a87ee2d10964cce6c1556