Malicious PDF — malware analysis report

Static analysis result for SHA-256 5361d50097449527…

MALICIOUS

PDF

78.6 KB Created: 2021-03-22 03:26:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 257d90a47e1ff7e3bc3f5bb5f37b86a6 SHA-1: 5d37310d17c6cda61cb87ad535271f619533098b SHA-256: 5361d500974495271d6266b7bb8e794f1a012e9302eaddc999d2ba25b91a4dc2
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or spam campaign. It contains a large number of external links, many pointing to Weebly and AWS S3 domains, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, appears to be a lure related to dating quotes, designed to drive traffic to these external URLs.

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://gimoguvi.ru/wix?keyword=quotes+about+how+you+shouldn+date
    • https://betetudiju.weebly.com/uploads/1/3/5/3/135348010/7a35ff8a36a.pdf
    • https://gelatotagubas.weebly.com/uploads/1/3/0/8/130813077/4619359.pdf
    • http://wugilunage.iblogger.org/85123899323.pdf
    • https://kekulepolunan.weebly.com/uploads/1/3/4/8/134889268/mefidivuremeb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/gekojulog/37644234187.pdf
    • https://s3.amazonaws.com/bidemewufa/friendship_status_for_whatsapp_in_tamil.pdf
    • https://7f03322d-63d6-449b-a8c2-a80beffeb2b6.filesusr.com/ugd/2994dd_a6aea231a1e74b37be6e953e0f8e79d4.pdf?index=true
    • https://s3.amazonaws.com/rekorewexidiwo/doctors_note_template_reddit.pdf
    • https://s3.amazonaws.com/retisovojor/14993904717.pdf
    • https://101c3d73-5e22-4da1-a203-a3a2a794ce88.filesusr.com/ugd/69a512_f9f206f6f3fc4e48981ec4279f64bfd6.pdf?index=true
    • https://s3.amazonaws.com/sorapobuk/netflix_for_android_6._0_1_apk.pdf
    • https://s3.amazonaws.com/gekojulog/chair_yoga_poses_for_beginners.pdf
    • https://s3.amazonaws.com/zepifudoxapo/mcgraw_hill_connect_math_answer_key.pdf
    • https://s3.amazonaws.com/rufonali/zakiwopiwodona.pdf
    • http://nonavijewiw.epizy.com/caribbean_cuisine_cookbook.pdf
    • http://lipepojofutuxuf.epizy.com/dilifiwozo.pdf
    • https://s3.amazonaws.com/pevuwarobuvowa/rosomoritazixolofuz.pdf
    • https://3794eb9c-cc8b-492c-aecc-44533f76aaa6.filesusr.com/ugd/1ee69b_ed20d91a82c84ba686b101ec33152eda.pdf?index=true
    • http://rebobimakefeli.epizy.com/candidase_recorrente_tratamento.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_off0000e846.bin
cb89372ef0297d61de05d841f1a219cccabfeb4544d19dd4b34927c0c4fce5d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE846 5048 bytes
font_01_sfnt_off0000f978.bin
43bd93d3320ac40908ae604965f6695c518138b51dba08854f614e4cab353d2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF978 10644 bytes
font_02_sfnt_off00011d85.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D85 4324 bytes

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