Malicious PDF — malware analysis report

Static analysis result for SHA-256 df6aeccd7a5cd9cd…

MALICIOUS

PDF

78.4 KB Created: 2021-06-06 00:20:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee7f719b214855398cc944d6902bbcfa SHA-1: ac235eb5e913d0a51fc98e5d547d724b380169ea SHA-256: df6aeccd7a5cd9cdd6df29c7d5db4377b5198e95e2f5b20f360b2c94e00869bd
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a PDF link farm, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs is a primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://crewmak.ru/pbw?utm_term=metodo+hipotetico+deductivo+definicion+pdf
    • https://wusafasugulub.weebly.com/uploads/1/3/4/5/134586051/wigipesozezukodadagu.pdf
    • https://static.s123-cdn-static.com/uploads/4413712/normal_6003ebdcdda9c.pdf
    • https://cdn-cms.f-static.net/uploads/4496815/normal_6068e0ac2d170.pdf
    • https://cdn-cms.f-static.net/uploads/4476416/normal_601f850a5118e.pdf
    • https://tafivemusuwivik.weebly.com/uploads/1/3/5/3/135322605/wagew.pdf
    • https://xurizuful.weebly.com/uploads/1/3/4/8/134898541/e755c4248780.pdf
    • https://xonuveviriniw.weebly.com/uploads/1/3/0/7/130738603/pamili.pdf
    • https://mesakejaj.weebly.com/uploads/1/3/4/7/134754162/gisufatafuvijofi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/824e283c-8c1b-48ff-a11d-2882a03168c7/the_mummy_1999_full_movie_in_telugu_hd_720p_free_download.pdf
    • https://uploads.strikinglycdn.com/files/90c00c1e-2bfe-44d8-ac36-c0f7752e9546/6153038068.pdf
    • https://uploads.strikinglycdn.com/files/e91d88ac-f8a5-42a9-b9dd-7a3fdbe9cbcb/p_touch_1290_instructions.pdf
    • https://uploads.strikinglycdn.com/files/410aba76-6cc7-43b0-a234-4151aee1e75a/73598788290.pdf
    • https://uploads.strikinglycdn.com/files/f7a87ffe-bed1-4434-b364-6887144267f6/69286255927.pdf
    • https://uploads.strikinglycdn.com/files/07d75f29-d070-4de8-94d4-3b44fee70507/lg_inverter_ac_error_code_ch_38.pdf
    • https://uploads.strikinglycdn.com/files/6c2e92fb-b6b9-4bbb-a5a1-f21c6e77b893/69317167698.pdf
    • https://uploads.strikinglycdn.com/files/20a104fc-e2b8-406f-a3ab-bc9fe6f23d27/60940730803.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f483.bin
d89ef9b488b516cae6eae133f578caa9c2cc931bc14ff2f27e162bd688bc137b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF483 4792 bytes
font_01_sfnt_off000104ed.bin
8fd44459d26634d189ba1afe508ae683fa837d2373eaea90fc08addf77838b66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104ED 11412 bytes

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