Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad4e1b9bc05c363d…

MALICIOUS

PDF

98.3 KB Created: 2021-06-04 14:35:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 2aa61f356de9249ba02a3734c35425a3 SHA-1: 2a73bcb01833eea543d7c0248d449ba6cdd00253 SHA-256: ad4e1b9bc05c363d3ee431beddd248046d1bb189d7ea7fe42981f099be70741b
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to disposable hosting, and includes lures for urgency and download buttons. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 8

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://crewmak.ru/pbw?utm_term=sai+baba+songs+download+for+ringtone PDF link annotation
    • https://renepavavoz.weebly.com/uploads/1/3/4/0/134012855/9615515bbd48ba.pdfIn PDF document text
    • https://zaxifugerabapaz.weebly.com/uploads/1/3/1/0/131071175/5766631.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4388271/normal_60b679749476c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475737/normal_60354af380b60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460680/normal_606697b2d04b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445573/normal_6041b716ec54c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403560/normal_604e561848237.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371783/normal_5fe024234c060.pdfIn PDF document text
    • https://gijudopit.weebly.com/uploads/1/3/5/3/135321477/bb4325bb1f910.pdfIn PDF document text
    • https://xegiduburap.weebly.com/uploads/1/3/5/2/135294675/e842f645cd.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/d1db27a1-6dc4-4fa0-9d50-175d2faaa031/beats_solo_2_wireless_used_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a97d836a-f5cc-4ceb-9b40-3e7469e7d4eb/38046308173.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/722a9426-09e4-406f-85fb-0eeb4fd56742/kederubodutilezimokedo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa3fc729-0d16-4710-ae97-a4ae1a89e97a/17373181558.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ce361fb-4ba3-4e98-b36a-fdc39a5dba58/when_the_rabbit_howls_read_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25205d4f-46af-4873-aee2-95acb05a98b3/como_tirar_ar_de_cano_de_agua.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e6f1c19-85c2-4d71-93c4-1eb66ef0c9cf/14466822265.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f41ff274-cc54-49c8-88ba-114cbf5eb439/vajaxesaro.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA9 5196 bytes
SHA-256: 109779563fb2bf48c5adf28a6d57c08263a6559e38966536c370efe6b4c479f8
font_01_sfnt_off00012e5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E5B 11536 bytes
SHA-256: 57215a1b47377f747d7446eb5c539955742b84a3eaaf876df0baa15322c762ee
font_02_sfnt_off0001561b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1561B 16248 bytes
SHA-256: 433615ede74112ccbca646cb824c352a4a1e9b36fcea11fdd848241ff539da94
font_03_sfnt_off00016b8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B8B 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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