Malicious PDF — malware analysis report

Static analysis result for SHA-256 09057872960b4099…

MALICIOUS

PDF

73.1 KB Created: 2020-11-17 01:04:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 45adc924e94985486981b16cedb456ef SHA-1: ead08872bef706cd939f5dd24eccf807344f80c3 SHA-256: 09057872960b4099c9ab8bef5c6a54a1b3b7946c0ec2858ce3692b59387fe736
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on link farm domains and flagged as malicious redirectors. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to 'general biology test questions and answers pdf'. The embedded URLs are likely used to redirect the user to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://ggtraff.ru/wb?keyword=general%20biology%20test%20questions%20and%20answers%20pdf In PDF document text
    • https://xafasujogi.weebly.com/uploads/1/3/4/3/134374351/2818750.pdfIn PDF document text
    • https://pikupazu.weebly.com/uploads/1/3/4/5/134577858/nozakukoveko.pdfIn PDF document text
    • https://zeginuvo.weebly.com/uploads/1/3/0/7/130775519/f27743cf.pdfIn PDF document text
    • https://juromimabosag.weebly.com/uploads/1/3/4/6/134644914/rojefesusoxafefis.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://s3.amazonaws.com/xesigeze/bristol_channel_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12dd74e1-56b5-42f6-8ff6-7c6f91c8b301/xetivukelo.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/42239176506.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/wimopomipa.pdfIn PDF document text
    • https://s3.amazonaws.com/divikufifir/637164517.pdfIn PDF document text
    • https://s3.amazonaws.com/zedudo/honolulu_staradvertiser_obituary.pdfIn PDF document text
    • https://s3.amazonaws.com/tagorarib/buy_cigarettes_online_from_new_york.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/824efe1f-d4ca-43ef-acf1-3014138a73a9/39306480307.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD243 5580 bytes
SHA-256: 05106e948774b4440d5a85c3b2963ea2304a1be69659e80a065c62848533ea74
font_01_sfnt_off0000e551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE551 10636 bytes
SHA-256: 7733837ac2f33e519fad3c6ddc3df699b603ad3ea30ab8b316ef4a1ba66a637c
font_02_sfnt_off0001099d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099D 4324 bytes
SHA-256: 781b9fae2fb9201b4a05d2041fea553bb2973f1d011ab9c51e3326c72e342c60

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