Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c575f702603cf90…

MALICIOUS

PDF

75.6 KB Created: 2021-05-08 21:41:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a79e4d22c7aad3dfc3e19d8d6ead9ac5 SHA-1: cc6718109c3fbe66c94a0af7d796164008e0f8e4 SHA-256: 5c575f702603cf907720ecff7c6200ecc7bfc3e313c70bdd431c46106cba26e8
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many hosted on disposable domains and utilizing UTM parameters, suggests a phishing or spam campaign. The document body, though heavily obfuscated, contains text related to a common search query, likely serving as a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://nipisod.ru/strik?utm_term=how+do+i+charge+my+x+mini+speaker
    • https://cdn-cms.f-static.net/uploads/4501206/normal_605fba124d057.pdf
    • https://retenosarubus.weebly.com/uploads/1/3/2/6/132695405/c1cc3c2783e09.pdf
    • http://tagemaruba.22web.org/24725250195.pdf
    • https://cdn-cms.f-static.net/uploads/4505358/normal_60579b36cb913.pdf
    • http://reborasiruv.iblogger.org/black_widow_song_ringtone.pdf
    • https://cdn-cms.f-static.net/uploads/4374013/normal_602a86e3927f2.pdf
    • http://kvyovk.xyz/algoritmos_ejemplos_resueltosgh9ls.pdf
    • http://vivujivavo.iblogger.org/bijusaji.pdf
    • http://lupaper.22web.org/36565742703.pdf
    • https://static.s123-cdn-static.com/uploads/4407818/normal_5ffc9fdfd66fb.pdf
    • http://housefashion.ru/42754391780cq5o5.pdf
    • https://binolopokam.weebly.com/uploads/1/3/1/4/131484395/0da185a33.pdf
    • http://brosbass.com/82235372986b1r76.pdf
    • https://fogufufizanalu.weebly.com/uploads/1/3/0/8/130813948/wafepumafo_duvaji_xuvuwonetaviso_vulurig.pdf
    • https://static.s123-cdn-static.com/uploads/4368506/normal_5fe278ca21917.pdf
    • http://stingeksoj.online/zetesirojopuukqb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://puwirosefifoxa.rf.gd/marketing_project_for_mba.pdf
    • http://taterawi.rf.gd/jusewokuxubususavawebepi.pdf
    • http://rufolexuvolup.epizy.com/14092356497.pdf
    • http://julisanusifi.rf.gd/8729151243.pdf
    • https://2ac56fc1-f7ee-4366-9cb2-1681469c68ee.filesusr.com/ugd/b914b5_724266b870034acca0c699474e769076.pdf?index=true
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_542a83bfe0e6450da0275b32e1ff9208.pdf?index=true
    • http://lugirike.epizy.com/nekepabinixaxoluvalagotu.pdf
    • https://b962d5b8-8819-42e3-9ba3-d95e8366760e.filesusr.com/ugd/f51585_a4879cb9e1a14f269cece57df0083b19.pdf?index=true
    • http://pemukusa.epizy.com/99221036606.pdf
    • https://203e60c5-e32a-4587-ab6d-31d66de6d5b9.filesusr.com/ugd/014c36_88dfe5c957b14e81ac1a8388f6d6c2e2.pdf?index=true
    • 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_off0000e96b.bin
27ed1cb42c3efbcd16cf8f41f05e37e9194e939db8d08ba1a28140c656a8eaa4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE96B 5740 bytes
font_01_sfnt_off0000fcea.bin
b6ecf70b8130edcb020ea755396bc62addac5220f0ba9519b3f9ef923d812799		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEA 10444 bytes

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