Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c8944e8a8cc9f68…

MALICIOUS

PDF

87.5 KB Created: 2021-03-24 21:37:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b195d01b6a7af1cf984b84589b09040c SHA-1: 7146d717ee2cfb961c5eed5832879453020a2985 SHA-256: 1c8944e8a8cc9f68f35e91bd59400b34b0583714124000fdc4c3cbcefcd3a52b
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://druttle.ru/wix?keyword=finding+slope+from+a+table+worksheet PDF link annotation
    • https://zusikazokek.weebly.com/uploads/1/3/1/4/131453156/guwefafubo_luvededu_zegojinolezad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381546/normal_603501449df25.pdfIn PDF document text
    • http://gidpopiteru.com/tablet_irulu_x7_hard_resetcv3i6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379744/normal_604946c7055cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466173/normal_5fe2413fa451c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403121/normal_600ae4d88fd49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379856/normal_601ccd6785ad7.pdfIn PDF document text
    • https://wiruwopifezub.weebly.com/uploads/1/3/4/3/134345133/zitosir-tipuriba-temasefezif.pdfIn PDF document text
    • http://instapriz.website/sage_the_gemini_2020_songs2ty0t.pdfIn PDF document text
    • http://topvideo.design/38093238008pl879.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/kikunojulejuj/wafimiliwub.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/56861259862.pdfIn PDF document text
    • https://6f2fb29c-15f2-4b08-b525-3eb91a7f0a41.filesusr.com/ugd/c3548c_d2290ec3922d4eb28e380dc5d23eb475.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/perurulexi/gree_air_conditioners_remote_control_manual_yt1ff.pdfIn PDF document text
    • https://s3.amazonaws.com/sutawowirosuvuv/72760472829.pdfIn PDF document text
    • https://4adff18d-dc39-4349-be2c-eeb12737f1cb.filesusr.com/ugd/9117e0_9880bedeb8d24d16aa1a048b5224c23c.pdf?index=trueIn PDF document text
    • https://f579be4a-c2ec-451d-94ee-532237c06880.filesusr.com/ugd/9f6a24_f1fd436074cf46bd900910d953658ad2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sigobija/ley_de_ohm_libro_de_fisica.pdfIn PDF document text
    • https://1639490a-f715-481e-9fb1-af38d332269b.filesusr.com/ugd/a59130_a517b7d21de84fb79d4ba18778c6d0de.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/forixifotuxugonobi.pdfIn PDF document text
    • https://e4586023-485a-43f1-9451-2d404684c5b7.filesusr.com/ugd/95ff22_23dd89f3eb9f4df69284c9e8490aacea.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/28003835738.pdfIn PDF document text
    • https://s3.amazonaws.com/luropi/lymphoma_contouring_guidelines.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_off00011b2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2F 5704 bytes
SHA-256: 8ae279a37ffb65aed40080a664cf0b57fc9db4a4749031388b5a71ad964dec68
font_01_sfnt_off00012e84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E84 10116 bytes
SHA-256: 95e17a1e5e47478619e81052cbd758168213929439300b6611632dc64ea59ad0

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