Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d81f2f1d181236d…

MALICIOUS

PDF

46.5 KB Created: 2020-10-06 15:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f1e9d7bc843c68a0afbad8018cc62e47 SHA-1: 3b6f718d0a134a6d64935af7779572019185171a SHA-256: 1d81f2f1d181236d0eb5d5f91f6260a2e972bc981018cb66d2cd9c98ee253bf0
124 Risk Score

Malware Insights

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

The PDF contains embedded URLs that lead to known malicious redirectors and disposable hosting, indicating a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains a reference to '2020 chevrolet avalanche manual' and a URL that aligns with the malicious redirector heuristic, suggesting a lure to trick users into clicking the link. No scripts were extracted, but the PDF structure and embedded links strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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 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.
  • 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/strik?keyword=2020+chevrolet+avalanche+manual In PDF document text
    • https://site-1043519.mozfiles.com/files/1043519/vulep.pdfIn PDF document text
    • https://site-1043451.mozfiles.com/files/1043451/sizokidikilaze.pdfIn PDF document text
    • https://site-1038313.mozfiles.com/files/1038313/42404540863.pdfIn PDF document text
    • http://files.academyofintegratedtherapies.com/uploads/1/3/1/1/131163667/8022716.pdfIn PDF document text
    • http://files.positivelypinckney.com/uploads/1/3/0/7/130739916/9407002.pdfIn PDF document text
    • http://files.stjosrcs.org/uploads/1/3/1/4/131407051/b09ac77.pdfIn PDF document text
    • http://fiwutopa.africanqueensdance.com/uploads/1/3/1/4/131454436/5080724.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/aaf8e758-847d-4bff-96bc-c1fa2904a677/1556161971.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8711ac9d-2aa0-4348-82b2-4c35538fdb5b/6700793559.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_off00006b79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B79 4936 bytes
SHA-256: ba97e1bd6c0082932b371eab81e17635a930f1c81ea7d7df1226a098708e2591
font_01_sfnt_off00007c04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C04 10332 bytes
SHA-256: e027424db4ab8183fbf9c9b35fa0c93a1fcc76798ba4b21282ee6bd8995b827d
font_02_sfnt_off00009f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F49 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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