Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a4f8a8afb8b3ebe…

MALICIOUS

PDF

69.7 KB Created: 2021-01-15 06:09:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 86d3164a1176412db616ee3382aac02c SHA-1: e6d2fc8008bb9015b7aa25d9d36834643fa8690c SHA-256: 3a4f8a8afb8b3ebefae1fa971d3a7e08deea9f0b59f5b1a056275486cd341bce
184 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://traffking.ru/aws?utm_term=medscape+new+hypertension+guidelines', is identified as a malicious redirector. The document's structure and the presence of numerous links suggest a phishing or redirection attempt, likely delivered as a spearphishing attachment. No scripts were extracted, but the heuristic firings strongly indicate malicious intent.

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/aws?utm_term=medscape+new+hypertension+guidelines In PDF document text
    • https://site-1176575.mozfiles.com/files/1176575/mackintosh_probe_test_report_uitm.pdfIn PDF document text
    • https://site-1200721.mozfiles.com/files/1200721/pabotuzeboxepulox.pdfIn PDF document text
    • https://site-1168535.mozfiles.com/files/1168535/monster_world_fire_mod_apk_full_version.pdfIn PDF document text
    • https://site-1174473.mozfiles.com/files/1174473/26303066353.pdfIn PDF document text
    • https://site-1185125.mozfiles.com/files/1185125/smart_card_recharge_delhi_metro.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481675/normal_5fe4ff052c51d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387586/normal_5ff10529e445b.pdfIn PDF document text
    • https://site-1178186.mozfiles.com/files/1178186/23171607661.pdfIn PDF document text
    • https://site-1175290.mozfiles.com/files/1175290/61536362392.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/mejigavukolu/apa_annotated_bibliography_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/meteor_garden_2018_all_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/lirik_lagu_afgan_bukan_cinta_biasa.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_off0000c736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC736 5416 bytes
SHA-256: 5e236dca74bcd3cfaeadcd489f23fa180f604441ac2bad1d39913bc2b21a5291
font_01_sfnt_off0000d9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B6 10032 bytes
SHA-256: 6ecfa0af8738b338ba22e8a05e92a6bcc541b254b3d529b991e878750b7b40db
font_02_sfnt_off0000fc1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1E 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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