Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f3402fd9f50cc95…

MALICIOUS

PDF

91.0 KB Created: 2020-11-29 12:35:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d74960f22137f68745612e8552e3ccaa SHA-1: 9183ee1ad95a88c00dd5108dd8d134fa838b2adc SHA-256: 1f3402fd9f50cc95e7a34118977fed4d3bb800ab3b57b91e0d96d4345b4d3d9e
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The ML classifier also strongly indicated maliciousness. The embedded URLs suggest an attempt to direct users to external, potentially harmful content, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=drunk+on+you
    • https://cdn-cms.f-static.net/uploads/4419642/normal_5fb583db57a22.pdf
    • https://dirigesibujov.weebly.com/uploads/1/3/0/9/130969991/tokodefutiwo.pdf
    • https://cdn-cms.f-static.net/uploads/4475728/normal_5fa65b3245301.pdf
    • https://cdn-cms.f-static.net/uploads/4366009/normal_5f8ff428150d8.pdf
    • https://cdn-cms.f-static.net/uploads/4459916/normal_5fab334ac595e.pdf
    • https://cdn-cms.f-static.net/uploads/4382429/normal_5fc2ddc255b18.pdf
    • http://www.opentle.org
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4f9bc940-159f-462c-acc0-024e971710f6/basic_and_bedside_electrocardiography_ting_vit.pdf
    • https://uploads.strikinglycdn.com/files/eae32d91-8920-4d60-9129-63c8644ab657/71904168999.pdf
    • https://s3.amazonaws.com/wisuw/wogosanepafafojemeremasil.pdf
    • https://s3.amazonaws.com/susopuzupure/pesomopenotajub.pdf
    • https://uploads.strikinglycdn.com/files/ab79b997-1125-45a6-a0bb-1a93d59986df/the_draco_trilogy.pdf
    • https://s3.amazonaws.com/jebupofedijakuk/95646357416.pdf
    • https://s3.amazonaws.com/jimugivos/29774704977.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://www.gnu.org/licenses/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000ff41.bin
781e10864846c6ed63cd43d7d0fa1efb62ebb91688e9133dc0267f9e8c7085e0		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFF41 12136 bytes
font_00_sfnt_off0000c5f1.bin
e1356409c8ae56993aedf17bbca054257e78e762c2571ad75e07a7a6515f997f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F1 13660 bytes
font_01_sfnt_off0000f01d.bin
ae979bd977e3fb376df7841d85f61b0e417cc6a0a77711d57971d993ea367a71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF01D 4424 bytes
font_03_sfnt_off00012181.bin
54531802ce35b47501daae1535d46d81a162b86bc721a19729e3b45ddbbc57e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12181 11884 bytes
font_04_sfnt_off00014842.bin
51916e08ba3314e41f6604021376b53d2a921b35e9ccda717e7b780f22163610		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14842 16092 bytes

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