Malicious PDF — malware analysis report

Static analysis result for SHA-256 5997a87947f272fd…

MALICIOUS

PDF

76.8 KB Created: 2021-05-29 04:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 39dd00da7aa2cc4a1d6b8a9cf54c581d SHA-1: ed01c56be9a63f241d28967472dd5300e76c1b29 SHA-256: 5997a87947f272fd2279df034a0771633b5caffdc5044fc6013a8f36333df319
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.
  • 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://lozipotod.ru/strik?utm_term=se+puede+aumentar+los+senos+de+forma+natural PDF link annotation
    • https://vogemafebin.weebly.com/uploads/1/3/4/2/134235603/9407159.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484639/normal_5fd1ace88f7d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370097/normal_60238b6dcce5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404116/normal_600cbfb170ef0.pdfIn PDF document text
    • https://xoxigukot.weebly.com/uploads/1/3/4/8/134861038/4114843.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469103/normal_6049c1074e36e.pdfIn PDF document text
    • https://zomafada.weebly.com/uploads/1/3/4/7/134772300/dulumalesijufifobi.pdfIn PDF document text
    • https://balojuboz.weebly.com/uploads/1/3/7/5/137506431/netesesa-balif-xajalalap-zuxupukere.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449965/normal_60365fcd719a0.pdfIn PDF document text
    • https://fofijibub.weebly.com/uploads/1/3/3/9/133999799/fumip.pdfIn PDF document text
    • https://befadileniralan.weebly.com/uploads/1/3/6/0/136082268/96b4c9558.pdfIn PDF document text
    • https://dujibirarikow.weebly.com/uploads/1/3/4/3/134321406/dedewokiminurofux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450148/normal_60215e36e414d.pdfIn PDF document text
    • https://nusuwexob.weebly.com/uploads/1/3/4/3/134352417/1891603.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/91db5015-91d3-473b-9916-131bab9f2830/carrier_weathermaker_8000_inducer_motor_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2181dba-d2b1-436f-b38e-3820f9e9d642/kenemaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86169f2f-adfb-48a9-a4bb-9ccdd6cba796/53103972514.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83c8a0bc-f2aa-4555-897b-0e9a106d4b2a/rudikisoli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39735898-f4b6-471e-ad09-88431e728b38/vizutalolom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a10709e8-6812-45d4-9315-d4ede9c3de78/kala_bhairava_ashtakam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e97cc36-28ee-4b54-816e-96a3f89836a4/gawixe.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_off0000ecfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFC 5292 bytes
SHA-256: 93ea55eb656505a2056fb0195445b8282cc329904aecb4c6d512bca7524ce2ed
font_01_sfnt_off0000fee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE3 11340 bytes
SHA-256: 689d93fb7634c093209b71bd1f24ff86d0e08336edc9be3407d3b94a50018da7