Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b6c1ef32aed4155…

MALICIOUS

PDF

71.8 KB Created: 2021-03-07 09:24:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 35670b3cb34ac223a6bd065affcc7639 SHA-1: 4433153840b5d51c401978e810f76e8c5e7a6074 SHA-256: 2b6c1ef32aed41553c2279a6f056626324b339f8be19bf6de4fa8da1af8fdeb6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are generated to appear as legitimate SEO content, but lead to potentially malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and appears to be junk data, but the presence of external URIs and the PDF_SEO_LINK_FARM heuristic suggest a link farm or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://nipisod.ru/award?keyword=christmas+carol+go+tell+it+on+the+mountain+lyrics PDF link annotation
    • https://cdn.sqhk.co/wotirixa/eXDOQsr/68918116578.pdfIn PDF document text
    • https://cdn.sqhk.co/kawinojos/cgiGhjz/wedusulunaneradu.pdfIn PDF document text
    • https://cdn.sqhk.co/miropefaneka/yig3EuS/tadapubaf.pdfIn PDF document text
    • https://cdn.sqhk.co/givesaxi/jhWGiaK/happy_hop_kawaii_jump.pdfIn PDF document text
    • https://cdn.sqhk.co/sulubejes/uhighCS/25379174044.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6f465708-eb37-4ee2-8658-ebeec6cd93ea.filesusr.com/ugd/4bb103_e1bb7bd798064af0901d8c2f95152ffb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b5bb74b-80a4-4648-a194-b76c52f12d7b/1183640005.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a3a779a-d8f1-4cbb-913e-a374e5ef6152/what_is_the_z_score_for_90_percent_confidence_interval.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74f1109d-67e0-4b52-aa06-bcf29bf927c1/24909412656.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/734ce3ca-ab76-40cd-aa55-52b6329616cf/list_simple_safety_devices.pdfIn PDF document text
    • https://s3.amazonaws.com/rumezo/fijab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a96bf128-db06-4349-bdf2-6cf236ee0f2d/18946223862.pdfIn PDF document text
    • https://b564fea6-732e-489f-a029-a72dc6590de2.filesusr.com/ugd/6a4619_57d377421f2a40f59f3bf3f1af72847b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cfb21d2-21be-417c-9209-521497074180/xudapageguwoke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dbab1c8-22f4-4935-a83d-e9c41e201123/how_do_i_install_google_play_on_my_kindle_fire_hdx_3rd_generation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b786d124-5184-48e0-acde-fd92bf52cf46/bunapisozivovafoxez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb646c1f-6ee8-4871-93f7-afd2b408da98/dodizuboralajozazumaxa.pdfIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/gajapalojorupobiwepig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f14c74a-0b30-4d68-b844-7ad4f15587e2/furevab.pdfIn PDF document text
    • https://7ae52be2-ba3c-41fb-8935-29281088223e.filesusr.com/ugd/affaa6_28e52047b5bb4d41bf888770c265b0ed.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b106023-54b4-4252-9463-4fcba7111977/anthony_de_mello_prayer_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dfc04b9-42eb-479a-a417-7d1255c7a5f8/survival_food_list_australia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c790eb27-40cb-47ac-9aed-e9ae103e0435/why_my_spectrum_remote_is_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba9234bf-17ee-44db-b598-6b37c41cc54f/fetebijikefak.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_off0000dc6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6F 5220 bytes
SHA-256: 8fcc5250ed1ca41ba7db17a4ac32f714f1f0283f6cf4f927fc7b05f474ae6067
font_01_sfnt_off0000ee05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE05 10328 bytes
SHA-256: 972defbd2e7977faa418130a2743e8913b2995e06828fa038748a7e2ed30c6e7