Malicious PDF — malware analysis report

Static analysis result for SHA-256 50958d1983225dc7…

MALICIOUS

PDF

73.9 KB Created: 2021-02-24 10:38:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: c6866bf6b3e0ae701953a2a5a4e1f977 SHA-1: 7f88249f862d48a8261433ec24b6192369fee61b SHA-256: 50958d1983225dc7d47e0f59f6bb77f9ec7f7991a0ad19d27ae201e97684a452
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV specifically flagging it as Pdf.Phishing.Trojan. While no scripts were explicitly extracted, the presence of numerous external URLs points towards an attempt to redirect the user to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/wix?keyword=pinch+hitter+3+tyrone PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4467277/normal_5fc90866ec560.pdfIn PDF document text
    • http://zosoxefu.22web.org/3944703083.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379615/normal_5ff2bed80d44b.pdfIn PDF document text
    • http://moledibatu.22web.org/chord_overstreet_song.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413454/normal_60209a0ca9a2b.pdfIn PDF document text
    • https://nuguserofaj.weebly.com/uploads/1/3/0/9/130969707/wujefaj_bibemududadu_xaran.pdfIn PDF document text
    • https://molawakipo.weebly.com/uploads/1/3/1/3/131379716/1952654.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452400/normal_6035d0e4a170b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490542/normal_6000b053926d5.pdfIn PDF document text
    • http://ziwavabewite.66ghz.com/44950958459.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371005/normal_5fe2d2c142415.pdfIn PDF document text
    • https://kepiloxuxamife.weebly.com/uploads/1/3/0/7/130740378/b8266d2c2ce9e.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/povelenavuviw/96005165695.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/canada_food_guide_2018_portions.pdfIn PDF document text
    • http://vokutenux.epizy.com/mac_shortcuts_cheat_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/51347738380.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/atatrk_s_reforms_education.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/39904848717.pdfIn PDF document text
    • https://s3.amazonaws.com/dusubonifu/pozonerasomomikajeroduwob.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F2 4732 bytes
SHA-256: 530ef1e51e8515a1168647280e7e4e2a87cc2da5771cac1221771ebab414dc96
font_01_sfnt_off0000f718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF718 10316 bytes
SHA-256: 33eb29b644c8aabaf5cb2900da56efb10da457d7f6fbbd752bf9449a1e08cde3

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