Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b12c9d4929d5e12…

MALICIOUS

PDF

78.1 KB Created: 2021-03-17 00:19:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9865e4a2022e53624dc15f3ec2d59728 SHA-1: 983f14af98972a636c5de3a48af9bd87b5f7b237 SHA-256: 2b12c9d4929d5e1280780d3ff4630439535eea851eb3d58a0032ae88d36c98dd
194 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dugedepap.ru/wix?keyword=senior+seminar+topics+political+science PDF link annotation
    • http://vivekawiga.sportsontheweb.net/86733644180.pdfIn PDF document text
    • http://fexevewuli.mypressonline.com/business_intelligence_analytics_and_data_science_4th_edition.pdfIn PDF document text
    • http://kifisafobubupo.mygamesonline.org/how_to_use_a_multimeter_to_test_continuity.pdfIn PDF document text
    • https://kifoguwo.weebly.com/uploads/1/3/1/3/131383532/8414988.pdfIn PDF document text
    • https://jafukixago.weebly.com/uploads/1/3/1/3/131380625/deloruvudodeke.pdfIn PDF document text
    • http://xuwuvewisin.mypressonline.com/dumujezila.pdfIn PDF document text
    • https://kekufekogaj.weebly.com/uploads/1/3/4/7/134768560/f8bf3d.pdfIn PDF document text
    • https://toxutumopomepe.weebly.com/uploads/1/3/5/3/135327812/85c54dc.pdfIn PDF document text
    • https://wekakukuzibeli.weebly.com/uploads/1/3/4/0/134000436/75a5bc52.pdfIn PDF document text
    • https://koxowugazetumul.weebly.com/uploads/1/3/6/0/136015765/mixowokiwor-relureduniperil.pdfIn PDF document text
    • https://bosupazalo.weebly.com/uploads/1/3/4/4/134473359/2362272.pdfIn PDF document text
    • https://tagalevef.weebly.com/uploads/1/3/0/8/130815582/2144327.pdfIn PDF document text
    • http://tivuximuliku.mygamesonline.org/will_before_we_were_yours_be_a_movie.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7162f0c1-3bb2-4775-9ad2-1e34613fb889.filesusr.com/ugd/595093_c9e4e5e561014a74afb5f680e88a3174.pdf?index=trueIn PDF document text
    • https://7737876a-f762-42ef-af6f-18b78abacabf.filesusr.com/ugd/9066bd_835d6e057d124aeeaaf874437b6d4e1e.pdf?index=trueIn PDF document text
    • https://3cde87c3-25ab-478b-b58d-ba072f1c7540.filesusr.com/ugd/255d97_0df0c740bfce4d248d4fbdb98e560b41.pdf?index=trueIn PDF document text
    • https://9b704b87-3668-414c-a24e-b30400fe0e33.filesusr.com/ugd/51c472_098f39429fb44236ba9db786481ed77a.pdf?index=trueIn PDF document text
    • https://f4a80ce2-0a24-44e2-aff7-13c87a434ee9.filesusr.com/ugd/ace063_95eb108b17984f7faf7dcd8e2576d6ef.pdf?index=trueIn PDF document text
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_6cbad0d853ae437182502267baac1161.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_off0000f398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF398 5180 bytes
SHA-256: d28d62fd5806ff126666b3aa3d17af6cca7562870c3e94e3fc1fcd1595722b08
font_01_sfnt_off0001051d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051D 11196 bytes
SHA-256: 77853fd5ff5c45ea96d9a8dab46f9b3586a19cc64f4e0e6030905e772508241f