Malicious PDF — malware analysis report

Static analysis result for SHA-256 fea7db81c97ffaf7…

MALICIOUS

PDF

84.0 KB Created: 2020-12-31 06:03:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4e63651d173ddd913e34717af6d8e94 SHA-1: 10214e10a3cef7faaf8e7124ec03c418a0173f44 SHA-256: fea7db81c97ffaf7f906bd360695be16f1caa05ca9a829dce043a5ff8b5fa875
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, many of which point to link farms hosted on Weebly. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=tiny+home+builders+orlando+fl
    • https://gosasolana.weebly.com/uploads/1/3/4/5/134523876/zidexunox.pdf
    • https://bizumoku.weebly.com/uploads/1/3/2/6/132681494/xubedetunizanojanum.pdf
    • https://bejitukinerebi.weebly.com/uploads/1/3/4/8/134890105/2a48c0a.pdf
    • https://static.s123-cdn-static.com/uploads/4390373/normal_5fe04d6769e6c.pdf
    • https://burivoren.weebly.com/uploads/1/3/4/2/134265934/xolilopuzeni.pdf
    • https://static.s123-cdn-static.com/uploads/4450419/normal_5fdefd72d3442.pdf
    • https://cdn-cms.f-static.net/uploads/4450139/normal_5faf35cf382d5.pdf
    • https://cdn-cms.f-static.net/uploads/4408172/normal_5fda2317e8df0.pdf
    • https://vuxomikum.weebly.com/uploads/1/3/4/5/134587944/dejav.pdf
    • https://cdn-cms.f-static.net/uploads/4371004/normal_5f9cd458668f7.pdf
    • https://cdn-cms.f-static.net/uploads/4412891/normal_5fb93fe2bc2c7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/xotomisen/itunes_location_android.pdf
    • https://uploads.strikinglycdn.com/files/0b92cf53-6897-40f9-8ca4-2e2cb72d74c6/62407490111.pdf
    • https://uploads.strikinglycdn.com/files/a4b5c04b-6ef9-46dd-8188-0aff9a0defaf/13403307329.pdf
    • https://s3.amazonaws.com/begijufadi/selena_full_movie_google_drive.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fed6.bin
28904a5b4b1af4244ee1a852f3c06059a6b65be2173801fbb134ee0c19eb8119		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFED6 5140 bytes
font_01_sfnt_off0001100a.bin
4df79ec95de3ba47ccc1fbe8bc12a65a6e18c5aa904ae8eaf019c22e3c2036c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1100A 10672 bytes
font_02_sfnt_off00013498.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13498 4324 bytes

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