Malicious PDF — malware analysis report

Static analysis result for SHA-256 771558b4bee06d58…

MALICIOUS

PDF

73.9 KB Created: 2021-02-21 18:21:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: f6bea996727e26d44dad5aacc8ad39a6 SHA-1: ebd3477d0bb9a4353df0d3e5e3b22b3669174a59 SHA-256: 771558b4bee06d58eb6a22f1575f841b3880db20130fdc6dadc5b116d24aead0
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, with one prominent URL being 'https://maypoin.ru/strik?utm_term=thinking+physics+pdf'. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded JavaScript, though not explicitly detailed in the provided evidence, is a common vector for malicious PDFs to redirect users or download further payloads.

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://maypoin.ru/strik?utm_term=thinking+physics+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4418984/normal_5ff75699cbebc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369506/normal_5fe6c91b26a3d.pdfIn PDF document text
    • https://xonutupusuvulin.weebly.com/uploads/1/3/1/8/131871786/3394678.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365541/normal_5fe570bb38b50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402932/normal_602f4786a0a4a.pdfIn PDF document text
    • https://ludatigesoz.weebly.com/uploads/1/3/6/0/136050408/9349155.pdfIn PDF document text
    • http://ueuniti.website/mujonodepizarimupedijabe6ck.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477651/normal_6009942b018b1.pdfIn PDF document text
    • https://tovibibuxajewen.weebly.com/uploads/1/3/5/9/135968099/ee03a4e3f77fea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370317/normal_6015ff2f7964d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414495/normal_5fdf6308aacc7.pdfIn PDF document text
    • https://kijomexed.weebly.com/uploads/1/3/1/0/131069838/19113fc9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403407/normal_5fd729c478ec6.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
    • http://retukazitoja.epizy.com/avarampoo_movie_ringtone.pdfIn PDF document text
    • http://zepumibofisi.epizy.com/desolidaninepazerowib.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_off0000d84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84B 4676 bytes
SHA-256: be14acbfc28995797347762c46cf9a14187d8304d68f2d1696dc5ab0983ecef1
font_01_sfnt_off0000e821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE821 10736 bytes
SHA-256: cd192db035b5341184886a3e28f9f80e58da87c95eab9189c076237a2cae013b
font_02_sfnt_off00010cbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBD 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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