Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c672afba36ba194…

MALICIOUS

PDF

77.3 KB Created: 2021-03-03 18:11:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7d22e290a4c9dff91c3a81af890c9d6 SHA-1: dc11e9631f0e37f4bc1017f36947a8b86f9d7ba3 SHA-256: 9c672afba36ba194edac9cc57833a06d370c223672a499a3f59ea0f7b5987351
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, pointing to various domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest the primary goal is to redirect users to potentially harmful external content.

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://resalured.ru/123?utm_term=sylvia+plath+poetry+theme
    • http://ewop.space/xorukelukinurimedelagfb68.pdf
    • http://top-agent.ru/who_played_atreyu_in_the_neverending_storybnyie.pdf
    • https://wurulukonena.weebly.com/uploads/1/3/5/3/135398735/ropesusa.pdf
    • https://jefelowomiwit.weebly.com/uploads/1/3/4/5/134599681/pojitirolugama.pdf
    • http://pumba.fun/bosch_wiper_blades_catalogvfiay.pdf
    • https://mapijilut.weebly.com/uploads/1/3/0/8/130873952/fbc72f.pdf
    • http://iglivesupportteam.com/nezaruvivutujisitok2j1n.pdf
    • http://xtrading.buzz/biblia_plik3ka.pdf
    • https://riwozetamozu.weebly.com/uploads/1/3/4/3/134331456/lilefiwidilim_dovusefil_gowikedonulunot_wowijozoxu.pdf
    • http://vulgargirls.fun/90936202191k3g39.pdf
    • http://copyrightram.net/large_format_film_cameraocda0.pdf
    • https://dofafurubes.weebly.com/uploads/1/3/4/7/134762343/gipuzabeg_rogebow_safetadujozegu_mugogifuzozuv.pdf
    • http://mishgen.com/number_of_rakats_per_prayerfjuim.pdf
    • https://kogafisefog.weebly.com/uploads/1/3/1/4/131438876/219084.pdf
    • https://wiwokuvivatazu.weebly.com/uploads/1/3/4/6/134629214/4879564.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/vifusupegiza/jigorefipiru.pdf
    • https://s3.amazonaws.com/wizedumi/37424271924.pdf
    • https://s3.amazonaws.com/fusidejebi/karnataka_human_development_report_2014.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e68f.bin
d890f625bfcefd0b6c5134219a421aea6bdb1c89be8cbfdf3829cdf37ef9e6c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE68F 4828 bytes
font_01_sfnt_off0000f6fb.bin
d48d266f827bc222f83f33fd6f914c57ee48dd643e5200fd5676871344a9e4ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FB 10464 bytes
font_02_sfnt_off00011a45.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A45 4324 bytes

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