Malicious PDF — malware analysis report

Static analysis result for SHA-256 916ea51528e7e232…

MALICIOUS

PDF

68.2 KB Created: 2021-01-14 14:10:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 4078784d588322f60042d291b2f86797 SHA-1: 7916e9c4de77c1eb2c8538643242791c3a8247b7 SHA-256: 916ea51528e7e23266007fb081493dcbfc8e6abf42d325b9f8f88280b30c2ecb
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic identifying links to known malicious redirector infrastructure. The document body is heavily obfuscated, but the presence of multiple links to disposable hosting and the ML classifier's high confidence score indicate a malicious intent, likely for phishing or distributing further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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?utm_term=radiation+detection+and+measurement+knoll+pdf In PDF document text
    • https://site-1178201.mozfiles.com/files/1178201/football_live_streaming_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/xejoverol/CjagcSF/hidden_objects_mystery_society_crime_solving_mod_apk.pdfIn PDF document text
    • https://site-1171658.mozfiles.com/files/1171658/36399117561.pdfIn PDF document text
    • https://cdn.sqhk.co/zivudasexoni/eJejc42/gitegalot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408989/normal_5fdb7e84f215c.pdfIn PDF document text
    • https://site-1181117.mozfiles.com/files/1181117/angry_crab_san_tan_valley_opening_date.pdfIn PDF document text
    • https://cdn.sqhk.co/zupodejadofe/fhh4idW/75230796895.pdfIn PDF document text
    • https://site-1168221.mozfiles.com/files/1168221/gogamomufewiguvefaboveke.pdfIn PDF document text
    • https://site-1178182.mozfiles.com/files/1178182/ramona_flowers_urban_dictionary.pdfIn PDF document text
    • https://dolunejasuvufa.weebly.com/uploads/1/3/0/7/130776008/dumesov_melevozoxedi_neteme_vekefavalejix.pdfIn PDF document text
    • https://site-1177174.mozfiles.com/files/1177174/driving_training_for_adults.pdfIn PDF document text
    • https://site-1174269.mozfiles.com/files/1174269/81653438696.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/setaxilitozuko/electrical_wire_size_calculator.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_off0000cea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA1 5372 bytes
SHA-256: 8c900e49e5eb90d8710e68868a77a02b4b86ea8eac740be14cc6b6babde7c179
font_01_sfnt_off0000e0d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D9 10384 bytes
SHA-256: 29409058870f69c7b3092b965058be5a36475276211a0230a52bd58f1e165912

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