Malicious PDF — malware analysis report

Static analysis result for SHA-256 43a85926d23a06fa…

MALICIOUS

PDF

38.2 KB Created: 2020-10-12 11:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 02f8bf2eed6ce4378e65d57ee829c7a8 SHA-1: b8b082dbcd72f3f3936b6da4bb5d62236f6b46fc SHA-256: 43a85926d23a06fa600aa65e1ec9b23a40e5178f2cd0c1bcb029ee9029f6380c
194 Risk Score

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://gettraff.ru/pify?keyword=skyjack+sj8841+parts+manual In PDF document text
    • http://jovil.amberkoi.co.uk/uploads/1/3/1/6/131637896/1010381.pdfIn PDF document text
    • http://files.sabinealthauser.com/uploads/1/3/0/9/130969655/526e2d19b.pdfIn PDF document text
    • http://files.amplifiedmobiledj.com/uploads/1/3/1/4/131438248/lakunupaterivara.pdfIn PDF document text
    • http://revudaxev.georgeflcharlesairport.com/uploads/1/3/0/7/130775136/388e9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/8bdcac66-ccb5-4889-ad55-1a3070bda196/netuwozajedewo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ffdb035-0c7a-46c3-892e-a7452f26ece4/timalolugifonunelawilab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c03c9af1-8d4e-43cc-9c03-91f8aa363995/wuratagob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6731f45-7a6a-488e-b80a-a7ae1bd3a008/fasibuzumefore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1d31e67-0d50-41d4-85b7-4afe8200e0b7/16251982372.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33fdf500-c833-4c58-81a2-3b1947dfc6ac/jukebofaxirifenujunitamen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b6cd1f6-fa89-447c-a9bd-4c022e545049/42285043542.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B04 5364 bytes
SHA-256: fc2d5c2df486d11f90f498d03122c9d5b316ea3cfd50884315b3483d592a7ea8
font_01_sfnt_off00005d3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D3A 9784 bytes
SHA-256: 62bcc624e378f62dbcd71b53d0dda3cb67e8519bf7b61e58a458de7e1228f793
font_02_sfnt_off00007e7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E7E 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176