Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9af4cee87e10131…

MALICIOUS

PDF

80.2 KB Created: 2021-04-02 11:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ccb43a845a3e2b8f11795cd8d41b870b SHA-1: 158427acb0dd13f75bbae7aca62a65f0d7f120d3 SHA-256: d9af4cee87e101313a3d68af4f0c13a4c0abaae3d84c6505ebc7ba40ef8a9fb5
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 0.9996

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://dafemum.ru/strik?utm_term=maverick+et-733+wireless+bbq+meat+thermometer PDF link annotation
    • https://cdn.sqhk.co/lilomovetum/jdigCr8/drastic_ds_emulator_apk_no_license_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/gukisafuw/iihFuhi/limudowizasu.pdfIn PDF document text
    • https://cdn.sqhk.co/remozemot/3gdjdLk/ladeneberaxuvez.pdfIn PDF document text
    • https://jadotonevuwupu.weebly.com/uploads/1/3/1/4/131407011/1046127.pdfIn PDF document text
    • https://cdn.sqhk.co/kiwapipu/hBggEkk/18050702394.pdfIn PDF document text
    • https://cdn.sqhk.co/dukasavubu/ajgSha2/kogukajububuvivudejepoj.pdfIn PDF document text
    • https://cdn.sqhk.co/revinoxu/icjdTaw/monster_truck_show_2020_lubbock_tx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371509/normal_605c5d139c991.pdfIn PDF document text
    • https://cdn.sqhk.co/sekigizakeku/dgiidHr/93471001788.pdfIn PDF document text
    • https://cdn.sqhk.co/fagiseregu/gGjjh46/defaxatu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530323/normal_6029644276c75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485313/normal_605822cfe0f61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408875/normal_60598e8086d30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482027/normal_604e115d20eb6.pdfIn PDF document text
    • https://cdn.sqhk.co/tixuniwe/kWMjfql/27322799927.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465548/normal_60076f3955898.pdfIn PDF document text
    • https://divaruwidis.weebly.com/uploads/1/3/4/0/134042650/257a96.pdfIn PDF document text
    • https://gumotamilo.weebly.com/uploads/1/3/5/3/135319527/liwuro.pdfIn PDF document text
    • https://cdn.sqhk.co/wexunaveb/qfjcEie/mr_level_editor_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/puxitika/egaSvJv/64122525812.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475739/normal_601a2c2ab791d.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
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC79 5484 bytes
SHA-256: 8f05dc0f133678eb1735d9a53ccddc68630d5bcd1d0178040983dd9f191f7fd6
font_01_sfnt_off0000ff4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4E 10960 bytes
SHA-256: 1e6c9c236f2b9860a4b1c0d22580cc07952bbd1e29ed598fde2b187b22da86be
font_02_sfnt_off00012494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12494 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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