Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3bff6b4b34c5835…

MALICIOUS

PDF

79.1 KB Created: 2021-01-11 08:15:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa408701eccd6adf72f261561f5b9d12 SHA-1: de82ff63f321e74225f5c1037c41073f63a40958 SHA-256: c3bff6b4b34c58350a0f47a3f02b7f7d400818f3fe0e9da6f062960b900936b5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical detection for a link farm and a high ML score. It contains numerous external URLs, suggesting an attempt to redirect users to potentially harmful websites. The presence of embedded JavaScript, though not fully detailed, indicates potential for further malicious actions like downloading additional payloads.

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafftec.ru/aws?utm_term=historia+de+la+arqueologia+mexicana+pdf
    • https://debivozujorebol.weebly.com/uploads/1/3/0/8/130813616/mogalizikulenawe.pdf
    • https://cdn.sqhk.co/risubibasero/Tlhi2hd/lesson_plan_for_teaching_learning_styles.pdf
    • https://paxudusumumo.weebly.com/uploads/1/3/4/3/134312151/4377832.pdf
    • https://cdn.sqhk.co/nokotadi/ihQhgia/71731725533.pdf
    • https://cdn.sqhk.co/vopufepivipe/fJqURhf/75796077863.pdf
    • https://site-1172155.mozfiles.com/files/1172155/melody_of_memory_dearly_beloved_piano.pdf
    • https://cdn.sqhk.co/befozaxulot/uij60hd/1621098208.pdf
    • https://cdn.sqhk.co/titipubaduw/Y1JNie9/globe_at_home_app_for_laptop_download.pdf
    • https://sekokuvujiziv.weebly.com/uploads/1/3/4/0/134096710/wulonotanuv_ziwikekajisazox.pdf
    • https://site-1175847.mozfiles.com/files/1175847/57096174383.pdf
    • https://pojekemo.weebly.com/uploads/1/3/4/4/134469054/3013e20a4132f.pdf
    • https://ponekuxu.weebly.com/uploads/1/3/4/7/134747949/nuraxawerugizonoxob.pdf
    • https://pixuvanibodaw.weebly.com/uploads/1/3/4/3/134374857/fafamoluwomu-vazalitipop-fefewup-borozepizef.pdf
    • https://cdn.sqhk.co/zatejurix/e8ibjci/43528947314.pdf
    • https://cdn.sqhk.co/fozuwasixeja/t1idgg4/66236641101.pdf
    • https://site-1168413.mozfiles.com/files/1168413/wood_inc__3d_idle_lumberjack_simulator_gameplay.pdf
    • https://site-1173612.mozfiles.com/files/1173612/the_whip_dance_1940.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4b5.bin
fbff44dbd921c9f04677d59903f71d0e6675f3b045f689c702177721b34d81c0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B5 5632 bytes
font_01_sfnt_off000107c0.bin
9b5d69cab7586d1d69d64d1577d510e09e4366383f69a21f73a9cc8941059bfe
pdf-font-stream PDF embedded font (sfnt) at offset 0x107C0 11440 bytes