Malicious PDF — malware analysis report

Static analysis result for SHA-256 59a78917a5d2ca53…

MALICIOUS

PDF

72.9 KB Created: 2020-11-13 23:37:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: aa43eec5473bbc131580f454f794c538 SHA-1: d911e746815654a84f3f4c34b95dbd18e993f1fd SHA-256: 59a78917a5d2ca53b42e72b8bf7a605902d4cb26de2d26af16aa08a5e1588d50
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. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffking.ru/aws?utm_term=carrom+pool+mod+apk+android PDF link annotation
    • https://pulepuvoko.weebly.com/uploads/1/3/4/2/134266128/5740157.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412382/normal_5fa81c2175b02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410194/normal_5faaddc03f316.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420245/normal_5f9a12551798a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366005/normal_5f86f966241b1.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/bopuxosavubare/half_day_leave_mail_template.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/dumavobi.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/10272441185.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/english_vocabulary_test_papers_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74335457-3bc0-4df5-9ea4-bafa2f6363f3/fs_i6_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/android_string_bold.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC22 4896 bytes
SHA-256: aaf2bd2553399b819a91eb7c5c1d3b1f00ed0ff517fab20d862a1feb99a5f924
font_01_sfnt_off0000dcad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAD 10680 bytes
SHA-256: 887f9614f63a03e1123433a2fbf9ed4f530f24834aa6a79fc6a606094347e7ee
font_02_sfnt_off00010162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10162 16160 bytes
SHA-256: 9ffc405fbed68b1ed35cf25504b2a045b5802e2074cf99e6920a228075e829fc

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