Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed91ad37ecf70bb8…

MALICIOUS

PDF

51.6 KB Created: 2020-11-09 11:37:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: f640d3dc233e6449f12e165442d95e3a SHA-1: 6341deea7044ec739970c7e74442968030e4e885 SHA-256: ed91ad37ecf70bb89fa7eee8253a0abcb48f74e957a370c66533aecaa37906bf
216 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://zuragani.weebly.com/uploads/1/3/1/4/131438510/501896.pdf.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://trafftec.ru/aws?keyword=order+foreign+currency+from+chase+bank PDF link annotation
    • https://zuragani.weebly.com/uploads/1/3/1/4/131438510/501896.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366973/normal_5f9f554a821d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375908/normal_5f92c98c12eba.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/a81ac4db-0b9d-4222-a3ea-34faea5a913b/sumudologuboxetokuno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16f3ca3f-970e-4f9e-a984-849979ac256b/miwaridejodegaferifapez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fefa05e9-2a4a-4dfb-9d88-330a48834404/59277485054.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/484bee21-8bc6-4aae-975d-ea0656cae4d8/audio_control_lc7i_review.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/zepabinodosunogas.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/dr_evil_costume_plus_size.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/atresia_duodenal_fetal.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_off00008800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8800 5736 bytes
SHA-256: 1a4644a0852070cca6df21ade852dcdce60427e7ad119ce6058f86c394cec251
font_01_sfnt_off00009b66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B66 11212 bytes
SHA-256: aa062ecb64d12c4032bd73fb8e34a59c6de96ce07a58c960fb9d99275c2c9d6b