Malicious PDF — malware analysis report

Static analysis result for SHA-256 57778e0dc3c7d00b…

MALICIOUS

PDF

73.1 KB Created: 2021-01-03 05:59:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 9a888b9162730795c6eb2fe4308f97cf SHA-1: e99a29f9002623696a3b7d3e390e9479fe50054a SHA-256: 57778e0dc3c7d00b7d84f383a20d41c9d805ab590c36d0843f17f9ca5d255c92
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 0.9994

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://traffine.ru/123?utm_term=my+wish+lyrics+printable PDF link annotation
    • https://cdn.sqhk.co/gujadozede/b8ie5gg/clockwise_meaning_in_tamil.pdfIn PDF document text
    • https://cdn.sqhk.co/vebiziwob/fXcDhgJ/goresirisu.pdfIn PDF document text
    • https://janogawe.weebly.com/uploads/1/3/0/7/130776821/c59c5982cd2da0.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://uploads.strikinglycdn.com/files/beed6c66-c2a5-45d8-ad6e-2de9fade2e94/muzakikodivedepud.pdfIn PDF document text
    • https://s3.amazonaws.com/wusone/dunesa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/011e9dcf-f531-4204-abff-cb5e548b4f92/idle_stickman_apk_mod_unlimited_money.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/495d3e75-6b47-498e-8b26-c31aac6a681a/american_casino_guide_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/786794db-6bd8-4258-906a-448db93901a9/xewav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a14094e-4248-4d50-828b-d100bf679e42/67810041156.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/maviradodepiko.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d57f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57F 5036 bytes
SHA-256: c67756e75dd17b4a7211a02791d59f2cb2b162444e5e7dad8e2641721ffc1d4c
font_01_sfnt_off0000e69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69E 10184 bytes
SHA-256: 59e4d2242b564eead72577e68ce38810b280fcc3eee00fc8f9e518252b16952d
font_02_sfnt_off00010983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10983 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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