Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bbca10fd3c338cf…

MALICIOUS

PDF

70.8 KB Created: 2021-03-28 20:55:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7d70fd79523d48773501a470d98372da SHA-1: de119aff452911644aa071af15595bba08c44938 SHA-256: 3bbca10fd3c338cff99e0064de511125de9001f6e439d285349f460aef2de1a3
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9993

Heuristics 5

  • 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.
  • 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/wix?keyword=fmf+audio+study+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446388/normal_6024859983a95.pdfIn PDF document text
    • https://mapimodedafibo.weebly.com/uploads/1/3/4/7/134708703/fudewiluso-timokenugamasi-subixegu-tuxitosudutunad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388619/normal_603a00599a523.pdfIn PDF document text
    • https://fodukajanewirom.weebly.com/uploads/1/3/5/3/135383911/370e2924398b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446045/normal_5fdee4ae92f66.pdfIn PDF document text
    • https://titenukom.weebly.com/uploads/1/3/4/5/134523185/tetimat_serujuminojume_bivomelasapanad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421629/normal_601e91629c6dd.pdfIn PDF document text
    • https://rexakutomas.weebly.com/uploads/1/3/0/7/130739652/bipidusuzebeg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457592/normal_5fe124598f673.pdfIn PDF document text
    • http://rijebipimaba.getenjoyment.net/gogadi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/vuvokaxupujazadofuzoviji.pdfIn PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/82980038566.pdfIn PDF document text
    • https://16fd3b15-5541-4454-9538-28daacbf497e.filesusr.com/ugd/e32576_0d34ba62d1874ac7936b183aea2f0f84.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/brother_hl-5250dn_driver_unavailable.pdfIn PDF document text
    • https://s3.amazonaws.com/lotibabakuj/android_wear_watch_faces_animated.pdfIn PDF document text
    • http://zokaramizixa.atwebpages.com/jadexeropigodiwep.pdfIn PDF document text
    • https://4a5660cc-52a2-48ff-9acb-4b4f1704cb6e.filesusr.com/ugd/81868d_59caabd61769491c83a87f79be1fbe8f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gapuruxumeg/fluval_207_dimensions.pdfIn PDF document text
    • https://s3.amazonaws.com/xokebore/jodozegazijepukiv.pdfIn PDF document text
    • https://44dd6259-7513-41c7-b2f1-b2b1fc385d2e.filesusr.com/ugd/63022f_066ea9b705fa4278bf532c636bc95641.pdf?index=trueIn PDF document text
    • https://ff743420-c5e2-4527-a456-70ddb2a1abd8.filesusr.com/ugd/5178f2_c93a7dab802a4908be8bd6b73394520d.pdf?index=trueIn PDF document text
    • https://f608bf75-187c-4b28-9621-af925c05c2b6.filesusr.com/ugd/05e3ad_8c740a6d538a43bf89ab2cecd01721f6.pdf?index=trueIn PDF document text
    • http://kapirexazi.onlinewebshop.net/81485615603.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_off0000d768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD768 5156 bytes
SHA-256: 89f2932ebd7c23380abe4a32ca2a24fa122a528add1d8483e6743c84e579a0ba
font_01_sfnt_off0000e8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F3 10404 bytes
SHA-256: b6705281bbba025f60e94cb0499698866fdb3bf06e0ed63ff0ce97c601697d93

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