Malicious PDF — malware analysis report

Static analysis result for SHA-256 378a3de4df1204e2…

MALICIOUS

PDF

76.5 KB Created: 2020-11-10 07:39:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 9bbf8474a7370fab4f4abca855792eae SHA-1: efcd41e4fc9d0d28123432174738b66736acfd21 SHA-256: 378a3de4df1204e21f529439b62f39a5057073a9fb799185d0e120731be120c9
164 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. It uses an invoice-themed lure. 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 0.9998

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://traffine.ru/aws?keyword=2020+medicare+fee+schedule+nj PDF link annotation
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/roriturosiw.pdfIn PDF document text
    • https://pijezokonogoxa.weebly.com/uploads/1/3/4/3/134308979/6274964.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404965/normal_5f968125daf24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389604/normal_5f92517d90212.pdfIn PDF document text
    • https://gurigibafex.weebly.com/uploads/1/3/0/7/130739571/417b39cf6aba936.pdfIn PDF document text
    • https://joleziravakejar.weebly.com/uploads/1/3/4/4/134460301/2582957.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448538/normal_5faa20b9d69a1.pdfIn PDF document text
    • https://mefinijusigoti.weebly.com/uploads/1/3/4/4/134499215/wopozogebofivepewi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380211/normal_5f917e7693060.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/zabevog/87775590802.pdfIn PDF document text
    • https://s3.amazonaws.com/gonavo/20848379974.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/eso_vvardenfell_survey.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/97138885257.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17c48c7e-7634-4ae9-871a-55c5fb70319c/smart_audiobook_player_pro_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/kivajav.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00A 5516 bytes
SHA-256: f718498627f6a169928ab5d0c869361d4c39e926b8b072c63c1f707e42e91f1b
font_01_sfnt_off000102a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A2 10208 bytes
SHA-256: fd3d1a101bc160432acefcc5dbba6aa8b490b0031fa642c6d41f3a17eecf17fd

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