Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b571c8e7ec722b0…

MALICIOUS

PDF

114.7 KB Created: 2021-05-19 00:47:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 908581e21160eae9803b8d47b98ae946 SHA-1: 8ec7612c59228a4f0e2c411cec3289b3bb011c1f SHA-256: 7b571c8e7ec722b0ff4f7e9d709525ecbe99227bedccfa05661cfebb8420943b
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://nipisod.ru/strik?utm_term=lotro+character+creation+music PDF link annotation
    • https://gunimumatepatu.weebly.com/uploads/1/3/5/3/135313318/f6ade7e34e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487419/normal_603453485056b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416302/normal_5feccfd348de2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426830/normal_5fd805bc66ac2.pdfIn PDF document text
    • https://zavitakeji.weebly.com/uploads/1/3/4/9/134904790/a85ca9b8df2a6ec.pdfIn PDF document text
    • https://varitutetuvux.weebly.com/uploads/1/3/1/6/131607805/4312340.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387808/normal_60336b791aa4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417807/normal_60269d71881eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489722/normal_5fc739781c1af.pdfIn PDF document text
    • https://kopupoko.weebly.com/uploads/1/3/4/4/134471128/3de8f5a3063886e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412378/normal_5ffba4991de95.pdfIn PDF document text
    • https://xuxefaposil.weebly.com/uploads/1/3/4/3/134393683/de1ee90d781daa1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382208/normal_5fd283c4c3ec7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471106/normal_600f80d0d143c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470540/normal_6048eccbc7dbb.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/wutisigila/burner_2nd_number_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/satedafadusizo/katzungs_pharmacology_examination_and_board_review_download.pdfIn PDF document text
    • https://s3.amazonaws.com/viregujipowuru/buwodom.pdfIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/27302936946.pdfIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/dusenojevawumosazoxid.pdfIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/sukajotuwaxuvuvupid.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/maslach_burnout_inventory_scale_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/dobikasukavu/troy_bilt_mustang_42_repair_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/nojexunaziwe.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_off000183bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183BF 4948 bytes
SHA-256: 7dac466c2e4b1881eca972252623d225f6eb5d7a2d7ac13b84329442ddce526c
font_01_sfnt_off00019468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19468 12384 bytes
SHA-256: 0bcae2e567c9086a29e5c88ca286572b3c7f6f345e9837d0d1b8d68f81f209cf

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