Malicious PDF — malware analysis report

Static analysis result for SHA-256 b42e2c560408d62d…

MALICIOUS

PDF

77.8 KB Created: 2021-03-16 11:40:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e44bef327c81caec3432ff09b0c933a7 SHA-1: 82d7911772898ff679cc3a5b190d9da22acf03e4 SHA-256: b42e2c560408d62dd2a3ac2a283b449d48e76f61f4de4a67576a8bfb4ff00e47
246 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document may prompt users for sensitive information like private keys or passwords. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or credential harvesting tool.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://ponafet.ru/award?keyword=authentic+leadership+definition+pdf PDF link annotation
    • https://cdn.sqhk.co/wogefosa/arhajdM/vufiziwaxixemisox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384820/normal_5fdb8f39b2eb3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450421/normal_603c6223325db.pdfIn PDF document text
    • https://rapalavosifezo.weebly.com/uploads/1/3/4/8/134886177/tujosimibikafewu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367310/normal_60280d5dd9c04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368230/normal_603e8e2e1b6ee.pdfIn PDF document text
    • https://vufupobuzalezu.weebly.com/uploads/1/3/4/8/134853030/fosopifutupo.pdfIn PDF document text
    • https://bofejaximolapob.weebly.com/uploads/1/3/4/7/134751884/mumalofizoba-koboremonemom-vawuj.pdfIn PDF document text
    • https://worojipe.weebly.com/uploads/1/3/1/3/131382243/wujurikubo_divaj_lerixe_sebato.pdfIn PDF document text
    • https://cdn.sqhk.co/pefemezized/gu2jggs/derailed_pour_house_durango_colorado.pdfIn PDF document text
    • http://detonicinitalia.website/danexab9ib.pdfIn PDF document text
    • http://dalnoboyi.xyz/pazepoxumebozebe5vxwx.pdfIn PDF document text
    • https://ripaduwik.weebly.com/uploads/1/3/5/3/135311581/188d376d5e6409.pdfIn PDF document text
    • https://cdn.sqhk.co/wivenute/h6mheLt/77919362673.pdfIn PDF document text
    • https://cdn.sqhk.co/tamaladafa/wUghjh0/xakob.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://efa91360-7c21-416c-9d60-3189e0beb381.filesusr.com/ugd/42ffc7_6cebbc06aa5343caa8174001d809c12e.pdf?index=trueIn PDF document text
    • https://0cc2a7d0-6f33-4335-9ec9-554d9418487e.filesusr.com/ugd/cb4a18_44e0b4c3e7d947568651abce88dd28ee.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9d4205e-b335-436f-b63d-b111774311b6/choir_jokes_about_altos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32cf1877-6864-4ce5-8ddb-e12c617a3eba/25488994186.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3ebef95-7209-48f0-80e8-98a8247838ff/eclipse_phase_second_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25d6a9f5-fe82-48b9-b287-64b8175d8d60/how_to_use_adhesive_vinyl_on_paper_bag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c6af5eb-a289-49c6-b4f8-840b05a4a77c/the_monkey_king_3_cast.pdfIn PDF document text
    • https://24451074-f53b-4065-993c-779ba3957988.filesusr.com/ugd/0ae25f_a3f2626e180e4d68b8081a5265938608.pdf?index=trueIn PDF document text
    • https://2d66045e-c276-4037-81df-184b25840e97.filesusr.com/ugd/cdf3e3_46280a108bcf46ce8635225fdf8d2bdf.pdf?index=trueIn 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_off0000f44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44D 5232 bytes
SHA-256: e97b3f041c52ffedbe50233d12e9cec7b865a624531c990f30f0b61945819e40
font_01_sfnt_off00010618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10618 10224 bytes
SHA-256: 5af17d58de02b10649dd32463ae99dac49ac79692c4bc88931527663a38afba9