Malicious PDF — malware analysis report

Static analysis result for SHA-256 01b7aa23b48b5b09…

MALICIOUS

PDF

85.5 KB Created: 2021-04-08 17:40:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: be54b7eec8e9de7f6a2f323e33eb550f SHA-1: dd8f111a1864a016f2bf747bdaf4136f14a62ee8 SHA-256: 01b7aa23b48b5b091413c4efe888e4cf25d0db813b4264be5600f8aabb4aa45b
226 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many of which appear to be disposable. Crucially, the document instructs the user to copy and paste content into a command-line interface, a common lure for executing malicious commands. The embedded URL 'https://maypoin.ru/strik?utm_term=cmd+commands+list+for+hacking' likely serves as a download source for a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://maypoin.ru/strik?utm_term=cmd+commands+list+for+hacking PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4488570/normal_60368d06b067f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427267/normal_60218efe4222c.pdfIn PDF document text
    • https://koreluluzoma.weebly.com/uploads/1/3/5/9/135972167/lidugosote-tamakir-nilar.pdfIn PDF document text
    • https://judunelikirolo.weebly.com/uploads/1/3/4/3/134375477/8caa718c28a0.pdfIn PDF document text
    • https://weraxugunelega.weebly.com/uploads/1/3/4/7/134719696/3997262.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383467/normal_5fe4f0d0a6490.pdfIn PDF document text
    • https://zejosawazir.weebly.com/uploads/1/3/1/8/131856185/nozumon-zuzatalero-govuduked-xurobitokunisi.pdfIn PDF document text
    • https://wijedokimevu.weebly.com/uploads/1/3/4/6/134649091/rajofa_fugira.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5d94d51b-2702-4b64-8df3-eadd022f3edc.filesusr.com/ugd/2ddd39_7161e03c1b3a44fcbf9a8535cb1b67f1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca4bf1a6-6b90-4e85-84ac-9f9eb5a5e844/mbti_compatibility_types.pdfIn PDF document text
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_aaa904416306406699041fa66d6ba74d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c6796ff-4d14-45fa-affe-94ab91de6cdb/2004_ford_focus_alternator_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d5885ba-4120-4ece-94d9-7875e8a15549/wabubetupabix.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/analytica_chimica_acta_author_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/xamapebonijos/vobesomekifogusowomude.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/kazifililokatebuxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bd6a677-34f0-4b07-ae07-6402b3a30b28/jonenamefopaput.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/63874606073.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/kadamban_full_movie_400mb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdca99dd-cd46-4a70-8d78-89258c7c4919/79321081729.pdfIn PDF document text
    • https://93655b3f-791c-4b17-adcc-ca91401ac088.filesusr.com/ugd/99b222_30f3286bd14040bfb00e87b4dd07533a.pdf?index=trueIn PDF document text
    • https://67a4337f-2b79-4d04-9c1d-2578c80f4945.filesusr.com/ugd/964009_90b585f186c948c5a46edf1261f66ef3.pdf?index=trueIn PDF document text
    • https://99b08629-27b2-41dd-83a1-938dc2ca35bd.filesusr.com/ugd/067ecb_fd530b41b569463dbf2f97385d048b07.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f474bf57-d15a-4da1-9e61-05da62d1d1eb/ryobi_ts1346_miter_saw_review.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_off00010eb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB9 5404 bytes
SHA-256: 2b6be8888dc666bfc817dd1984f5ee6bb0f3241fc29b70382e5d496497e6f06a
font_01_sfnt_off000120e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E5 11264 bytes
SHA-256: 4f82c881c5089221a2b3ec26294fe592b61b837ad2ff540d8338538dc33eb44f

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