Malicious PDF — malware analysis report

Static analysis result for SHA-256 61610a77b6b9f815…

MALICIOUS

PDF

102.7 KB Created: 2021-04-08 22:20:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 39c31f9b980cc7097c0e2e41f37531b4 SHA-1: 951d1caca20a913deb9c99f458d65c00910eee8c SHA-256: 61610a77b6b9f815984108e7390fc8d5b523a1853bcde4bfad1e0bb189494b0a
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 0.9988

Heuristics 5

  • 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.
  • 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://fokemale.ru/strik?utm_term=line+6+pod+go+worship+patches PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4495997/normal_6010321b3c2b6.pdfIn PDF document text
    • http://kojijeku.mygamesonline.org/23859473507.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471236/normal_601dfa1ea7be7.pdfIn PDF document text
    • http://xofelivigavas.mywebcommunity.org/skin_cancer_information.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415756/normal_60648efe56b0d.pdfIn PDF document text
    • http://foripekomufotir.mypressonline.com/first_alert_co400_carbon_monoxide_detector_battery_operated.pdfIn PDF document text
    • http://nozumupi.medianewsonline.com/advantages_and_disadvantages_of_globalisation.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xamapebonijos/97905693559.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e103c16b-aab6-4f53-b2d1-1d66fbc58738/57311051509.pdfIn PDF document text
    • https://f72b89be-0fa6-41ee-8162-331329ef78ce.filesusr.com/ugd/95089d_9a174926934c4445a4caafe710f5e6ee.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/86350270625.pdfIn PDF document text
    • http://noratev.myartsonline.com/31070285837.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/jiximupu.pdfIn PDF document text
    • https://s3.amazonaws.com/vinivuxo/rafotosejum.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/mens_haircut_places_open_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4aa9135e-df6c-4574-aa53-da61bf026712/kofasupirobagimus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be0ca12f-465f-4ed6-95fd-a3efc00ad508/how_would_you_describe_the_moonlight_sonata_on_piano_easy_slow.pdfIn PDF document text
    • https://cee4c475-053c-4dec-97e8-987d41263e46.filesusr.com/ugd/8c25c6_40b2bff0bdf64492b815637cd28427bb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/57438106-c5a3-455e-9c46-55566bd4c32d/engineering_drawings_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/biostar_handbook.pdfIn PDF document text
    • https://ddc7b23b-31e5-4b5c-aaad-d3b7cef26861.filesusr.com/ugd/e506b8_98c1843e4e0c4e6c934a6813eff120cf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pogolo/sweating_meme_template.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000131d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D4 3304 bytes
SHA-256: 7db4aa9dcfc42b3a6ef9a04f555e0b2fea6a31cf0b1e3bf67d3f0cf3b72bc559
font_01_sfnt_off00013db9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB9 5280 bytes
SHA-256: e1e7824a40bf523e7c62dc86ed783be87d3eb2517e81a1529d51fbd2905ffd2a
font_02_sfnt_off00014fae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FAE 14328 bytes
SHA-256: f2253adec8c0afb27d3235c53391d7f58afc6e3158499caafa237ec4dc31552b
font_03_sfnt_off00017d5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D5E 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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