Malicious PDF — malware analysis report

Static analysis result for SHA-256 58a2692c23743f60…

MALICIOUS

PDF

105.8 KB Created: 2021-06-14 04:40:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 78e312d139e685424e1df351ed61c18d SHA-1: 0382ccf2995f8fd298afbef73302998f5aa0a106 SHA-256: 58a2692c23743f606ed1d5bd3615a66c5782e78293843b2a8c341aff3af46223
206 Risk Score

Malware Insights

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

The PDF contains a malformed exploit stream and a large number of external links, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this is a phishing or trojan delivery mechanism. The embedded URLs point to disposable hosting and are likely used to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • 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://fokemale.ru/123?utm_term=bellanca+scout+flight+manual PDF link annotation
    • https://kanigonule.weebly.com/uploads/1/3/4/0/134017023/magusujiniruwatiwet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473645/normal_600c15a87cc18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496815/normal_5fd9af34aa4bc.pdfIn PDF document text
    • https://vojerured.weebly.com/uploads/1/3/3/9/133999986/94a0cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412151/normal_604f6fd1a5906.pdfIn PDF document text
    • https://mosugomepa.weebly.com/uploads/1/3/4/0/134096926/1454283.pdfIn PDF document text
    • https://kedepojab.weebly.com/uploads/1/3/0/7/130739947/vepugojepa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385847/normal_6052b2134a15f.pdfIn PDF document text
    • https://fujepibipaxider.weebly.com/uploads/1/3/1/0/131070521/2689440.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410731/normal_60000cef4ef3e.pdfIn PDF document text
    • https://vewudati.weebly.com/uploads/1/3/0/8/130873955/5483435.pdfIn PDF document text
    • https://lerorenoj.weebly.com/uploads/1/3/5/3/135390996/kazewexukuron-bozozesiman-sonoxepibati.pdfIn PDF document text
    • https://vesizolakaz.weebly.com/uploads/1/3/4/3/134333528/juvukuvili.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478952/normal_60634849b7024.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4325e1f-dfb7-43d7-af7c-ff2f1d6e88d7/kujegedafixeretofovozezep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db4558d5-eaf0-4aea-818b-6c688102694a/forina.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3fbfa79-65be-4413-9461-233e22798182/janavawas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a907aae-7e8b-4844-a7b3-dbc7ba3e7014/jinebedinulorif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85532483-9699-42fa-87f5-c72e4f3bed3d/rabutawexojalovizos.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_off00014bae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BAE 5248 bytes
SHA-256: a76993129d340b8abeff01373023bf407ca29d16c77f253f0fdcf7edbfcbfb47
font_01_sfnt_off00015d68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D68 11096 bytes
SHA-256: 5b47f20a92ae75812da8e8eb958376c96b42b210568cbf1b1f0947e4e45cc064
font_02_sfnt_off00018395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18395 16068 bytes
SHA-256: 9e1271d681207e96fe60c94df920a27091a957dc81e2614e9e6235263a34fce6