Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f9768a947aa0c7…

MALICIOUS

PDF

75.3 KB Created: 2021-02-18 10:54:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: fa0d4604127f0d8218c8476b823934e4 SHA-1: d7d3e4346a8ab00f6265f163014d71e173418651 SHA-256: a1f9768a947aa0c7e196412d5e7ff26d7abc2348230561da8ae2304f9b86e7db
214 Risk Score

Malware Insights

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

The PDF contains numerous links, including one to a known malicious redirector at 'crophysi.ru'. The document body, though heavily obfuscated, appears to be a lure for a PDF download, suggesting a phishing or scam attempt. The presence of multiple embedded URLs and the ML classifier's high confidence score indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=scientific+american+psychology+2nd+edition+pdf+download In PDF document text
    • https://fikosaxan.weebly.com/uploads/1/3/4/7/134753192/teniniwilijixumuv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471250/normal_5ff84954935d0.pdfIn PDF document text
    • https://fozujivopaj.weebly.com/uploads/1/3/5/3/135303700/9019105.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447271/normal_5fdb6062f05e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449014/normal_5fc84484eefb5.pdfIn PDF document text
    • https://sinukofulav.weebly.com/uploads/1/3/4/6/134634738/e5069.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419820/normal_602a49ef49ef3.pdfIn PDF document text
    • https://sadepejeriroxet.weebly.com/uploads/1/3/5/3/135337628/dolisamikulilal-jonaved-ruregud.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/fotojipifuzitul/49315138239.pdfIn PDF document text
    • https://s3.amazonaws.com/kavugusepe/dokabokesefibuje.pdfIn PDF document text
    • https://s3.amazonaws.com/bitizopovopaso/zulupenawabopiz.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/63294927193.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/64248193514.pdfIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/powercfg_battery_report_windows_8.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/zafusutovodakupizawasu.pdfIn PDF document text
    • http://xosumuzav.epizy.com/yakushima_hiking_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/tefurajum.pdfIn PDF document text
    • https://s3.amazonaws.com/tubupejevomo/ibps_po_admit_card_date_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/79788696229.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/2003_buell_xb9r_manual.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_off0000e761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE761 6000 bytes
SHA-256: 6624d015735bf12b08a138facab83e2345a7aef2a3a5007a0f811ce169c690d4
font_01_sfnt_off0000fbbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBB 10276 bytes
SHA-256: 86a61f08183997823ccc2226f8c22312e1317bad18bd6035ecc9ebe606133d84

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