Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f6269e08d9dd00e…

MALICIOUS

PDF

71.6 KB Created: 2021-05-22 22:08:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 5611d529a8816099ec89dd845c54a7b8 SHA-1: afc6e6fba83f82822ed90d2d97c1bc2e523ca6a7 SHA-256: 7f6269e08d9dd00ec87a982fb2a373e48e04e669e34a150995e45c4f6b55765a
214 Risk Score

Malware Insights

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

The PDF contains a high number of external links, many pointing to PDF files, suggesting a link farm or redirection strategy. One critical heuristic identified a link to known malicious redirector infrastructure at `https://yafferge.ru/strik?utm_term=language+disorders+from+infancy+through+adolescence+5th+edition+pdf`. The ML classifier and ClamAV also flagged this PDF as malicious, indicating a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://yafferge.ru/strik?utm_term=language+disorders+from+infancy+through+adolescence+5th+edition+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4454673/normal_600b32fd1fb62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416928/normal_60181cdc799e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454545/normal_6066936b9ce15.pdfIn PDF document text
    • https://kolabobinojojiv.weebly.com/uploads/1/3/4/8/134880551/0c11cfc1c.pdfIn PDF document text
    • https://vafukomoruf.weebly.com/uploads/1/3/4/8/134862603/jipemisejarewi_lokomisenatava_dubome_zizamorazuzarew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417314/normal_60506234e0a7a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421780/normal_5fcae8c333f48.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b57a499b-b8de-4318-a549-c40fff0054f8/34296147926.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/mort_terry_pratchett_review.pdfIn PDF document text
    • https://s3.amazonaws.com/xanunafojuloki/transform_cylindrical_coordinates_to_cartesian.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/arjun_the_warrior_prince_video.pdfIn PDF document text
    • https://s3.amazonaws.com/warapagefasovi/manualidades_para_nios_de_prekinder.pdfIn PDF document text
    • https://s3.amazonaws.com/sezewu/xitubunetoxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46e8fb29-bc54-4e32-acfd-bff23476daf9/midsummer_nights_dream_script_act_1_scene_1.pdfIn PDF document text
    • https://s3.amazonaws.com/gurafoga/foxumusizofitunoniwalovag.pdfIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/nuziniwafagupode.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/quran_english.pdfIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/12550291611.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/ek_tha_tiger_banjara_video_song.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_off0000d912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD912 5736 bytes
SHA-256: e5169c8e52958493d28d097bcc4765c161ad7562fe7535f3db7091857dd55f26
font_01_sfnt_off0000ec81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC81 10056 bytes
SHA-256: f92bc24104581b6f4960321ab5c2f26bd48b0df47360eab29ae561b772b659f5

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