Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa6fd80d3089c984…

MALICIOUS

PDF

99.1 KB Created: 2020-11-20 15:17:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7d1c4004be9d439e70f79023300f04e SHA-1: 18bd79a3bc3cedef7824b1b191b557e5e1ba9a1f SHA-256: aa6fd80d3089c984258c1e01f1a52fdd9caacf28c974a182a7f61b38b5fe7671
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. The presence of numerous external links, such as https://trafficel.ru/strik?utm_term=what+is+a+powerhouse and a link farm hosted on weebly.com, suggests an attempt to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards a phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafficel.ru/strik?utm_term=what+is+a+powerhouse
    • https://letitelow.weebly.com/uploads/1/3/4/5/134500939/dulube.pdf
    • https://jupelokuxaw.weebly.com/uploads/1/3/4/6/134601506/taguren.pdf
    • https://cdn-cms.f-static.net/uploads/4365626/normal_5f8758007695b.pdf
    • https://cdn-cms.f-static.net/uploads/4368731/normal_5fb7b7f6b57ea.pdf
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/7d3707d5d.pdf
    • https://cdn-cms.f-static.net/uploads/4447647/normal_5fa9862464811.pdf
    • https://jufikaparilo.weebly.com/uploads/1/3/4/5/134592165/12f3e0283.pdf
    • https://tufupuvakasu.weebly.com/uploads/1/3/4/3/134310035/lezafijijewasebup.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • http://www.opentle.org
    • https://uploads.strikinglycdn.com/files/d75cfbe7-1b6e-4180-b95c-cca78a3f3e4a/lozubozaxetatodalozis.pdf
    • https://uploads.strikinglycdn.com/files/c558f1a7-fe1f-4bf0-aa1b-6e49fd32793e/bikojokezixez.pdf
    • https://uploads.strikinglycdn.com/files/e8317f6c-dbf1-4349-8c32-4a14d9b76e32/images_of_angels_in_clouds.pdf
    • https://uploads.strikinglycdn.com/files/64491f2c-4aab-4ffa-b79f-1363f5c4a516/table_tennis_shoes_butterfly.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
    • http://www.gnu.org/licenses/gpl.html
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 9

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd62.bin
40cfd4cedefc53525bd4352a57525d3f8443581a2e40ffe4a8c378781febb278		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD62 5588 bytes
font_01_sfnt_off0000e0fb.bin
c7cf30a8d358be88f196171f260bc62f5f19be975ce5040d0ec52bb97f828635		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FB 4980 bytes
font_02_sfnt_off0000f1f8.bin
1620336da6018abf771a3b64a4739dbc5cc5761e5bcfd31f9568e9163b5e6178		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F8 2656 bytes
font_03_sfnt_off0000fcff.bin
6d897259d7ab9db79b0dbb16904cd99ff486aa7f4a475590a5d3e44eab6e0eed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFF 2328 bytes
font_04_sfnt_off000107b5.bin
b3976ad28991401f3a7e0d936621f3963ed8fd81aff5bedc9e25cf6548b1959b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107B5 2108 bytes
font_05_sfnt_off00011180.bin
c8cb303e765c67f43d6d34f29c1d02953890772ff7b697be779fb29335000f72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11180 6640 bytes
font_06_sfnt_off0001231f.bin
314d149462c8363a94c44d18d7c7a07f771205c05c772593eecf329e88ffae2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1231F 15900 bytes
font_07_sfnt_off00015343.bin
0dd342b43cae5a527336534b777fea5d9ae532e282e7f42ad4f2e59997d7c416		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15343 17844 bytes
font_08_sfnt_off00016ebf.bin
333cf0bae5291019b79d77a37696b89786718dc77a0e6f1c7356514a48765311		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16EBF 3276 bytes

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