Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a9330d069053cbd…

MALICIOUS

PDF

71.4 KB Created: 2021-02-20 22:53:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: d29baf8761f23fbdd0754ee559d2a4d6 SHA-1: 661f7a2104947356cd0eafdcf2972df109808cb9 SHA-256: 1a9330d069053cbdd162a599b068564fa075529f4bbd024fb4f21de3f2df6024
126 Risk Score

Malware Insights

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

This PDF document is flagged as malicious by an ML classifier and contains a large number of external links, many hosted on disposable domains. The document body is heavily obfuscated and appears to be junk data, suggesting the primary purpose is not content delivery but rather to host or redirect to a large number of SEO-optimized links. No scripts were extracted, but the presence of numerous external links points towards a potential phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://leonvi.ru/wix?keyword=olivia%2527s+italian+eatery+fleetwood+pa PDF link annotation
    • https://cdn.sqhk.co/nuvurero/hJRhffK/spiral_jetty_robert_smithson_khan_academy.pdfIn PDF document text
    • https://puriruwuz.weebly.com/uploads/1/3/5/3/135395363/xesuzefajoje.pdfIn PDF document text
    • https://gixatupugibezi.weebly.com/uploads/1/3/5/2/135296842/0f514d50.pdfIn PDF document text
    • https://cdn.sqhk.co/jeporikate/hboMyRe/euro_truck_simulator_offroad_cargo_transport_pro_rexdl.pdfIn PDF document text
    • https://viliwefat.weebly.com/uploads/1/3/1/0/131069961/7921703.pdfIn PDF document text
    • https://cdn.sqhk.co/murafabu/jauhbi5/1919389665.pdfIn PDF document text
    • https://fogasofimoxor.weebly.com/uploads/1/3/1/0/131071298/0dc78c.pdfIn PDF document text
    • https://terigemi.weebly.com/uploads/1/3/1/8/131856376/rafijokameboruwuwej.pdfIn PDF document text
    • https://jaxipalat.weebly.com/uploads/1/3/4/7/134746428/wokasen.pdfIn PDF document text
    • https://cdn.sqhk.co/bosamame/jupggDR/bluedriver_obdii_scan_tool_review.pdfIn PDF document text
    • https://wavixozuxukoreg.weebly.com/uploads/1/3/1/3/131380445/591618f9cedc34f.pdfIn PDF document text
    • https://resawipodejevi.weebly.com/uploads/1/3/0/8/130814711/4102506.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://s3.amazonaws.com/dixaleko/sojewalafuxuzokawunazi.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/rainbow_tables_free.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_off0000cd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD39 5136 bytes
SHA-256: 95c1e17b5aff4dd8442f3aef5ea8d029c0885b4d3686da7ad7c66ec99cb31941
font_01_sfnt_off0000dedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDC 10448 bytes
SHA-256: 52702686c164418697bf008fe1da0dbffb1f8aca24bc83fa7bd2362a77979588
font_02_sfnt_off000102b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B8 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

Open this report in the interactive analyzer, or submit your own file for analysis.