Malicious PDF — malware analysis report

Static analysis result for SHA-256 52defd7a1fd20304…

MALICIOUS

PDF

42.5 KB Created: 2020-11-09 17:06:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f63c1c6d413cd11500ddd96a5971611f SHA-1: ac706a27773364be846fe030e5d28325e66ff833 SHA-256: 52defd7a1fd203049f19b3eb72ddb57f651ce488606fb701e9e1770cebc1b67f
124 Risk Score

Malware Insights

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

The PDF contains embedded URLs that lead to a known malicious redirector, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to flight status and URLs, reinforcing the lure. The ML classifier also strongly indicated maliciousness.

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://traffking.ru/123?keyword=ka+661+flight+status In PDF document text
    • https://cdn-cms.f-static.net/uploads/4406456/normal_5f95a67510288.pdfIn PDF document text
    • https://gelekale.weebly.com/uploads/1/3/4/2/134266195/fitumo.pdfIn PDF document text
    • https://dilukali.weebly.com/uploads/1/3/4/5/134584555/5b32f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418746/normal_5fa05538e6203.pdfIn PDF document text
    • https://buliduxefexefux.weebly.com/uploads/1/3/1/6/131636978/fodudovifiwi_nonem_lokuzi.pdfIn PDF document text
    • https://wunaramalus.weebly.com/uploads/1/3/4/5/134576193/6acef1.pdfIn PDF document text
    • https://sizukejagu.weebly.com/uploads/1/3/2/6/132681884/8176664.pdfIn PDF document text
    • https://mivijupa.weebly.com/uploads/1/3/4/5/134578330/mutolekikeperokobub.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/megulu/eva_arturo_perez_reverte.pdfIn PDF document text
    • https://s3.amazonaws.com/vebogotexaf/5765506969.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93f3a344-3f09-4e0e-90e7-bed05baf446f/idylis_air_purifier_model_iap-10-200_manual.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004fcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FCC 5108 bytes
SHA-256: 36d5aae60bac41495c838b02bf7737ae7392de9502e1375a216d5be34b6c837c
font_01_sfnt_off00006144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6144 11624 bytes
SHA-256: 4c38ce2e5ce8d7321a822d500366a77a851c5518a9a7e2879cc805b94e9d66a5
font_02_sfnt_off0000881f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x881F 16132 bytes
SHA-256: 06d84a79787f49517cba9647d12dd77c675544b9e46e70dbd0c3ec2b8d2a160e

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