Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f272a9c414fdc52…

MALICIOUS

PDF

91.4 KB Created: 2021-04-26 01:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 983b431f0aa1bae504c63b3223fd421c SHA-1: d5958df23c1cdd9174028b366b2ff4998617b314 SHA-256: 8f272a9c414fdc52f1f270a41422fec64ac7654f77c3f7f707e2637565c946d3
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are obfuscated or use link farms, indicating a phishing or spamming campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, but the PDF structure itself is designed to host numerous external URIs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://ponafet.ru/strik?utm_term=navy+reserve+personnel+move+request
    • https://nafuvazufu.weebly.com/uploads/1/3/1/4/131407552/7943283.pdf
    • http://oneitstore.info/3195449055hf2km.pdf
    • http://olymp-trade.top/fitawoborazuf0rj0c.pdf
    • http://zyzycheat8.xyz/is_fresh_off_the_boat_getting_cancelledf6bbc.pdf
    • https://bexokafosirur.weebly.com/uploads/1/3/2/6/132695536/timizenatapedij.pdf
    • https://muwewixobajigu.weebly.com/uploads/1/3/4/3/134312624/sudujexupim.pdf
    • http://graatorama.space/rusamirejuraruloxerinuxomok6a1.pdf
    • http://1xbet-registr.site/how_to_adjust_the_heated_humidifier_on_resmed_airsense_10fgwmg.pdf
    • http://botamasixijo.iblogger.org/pdf_hatha_yoga_pradipika.pdf
    • http://pesetatin.iblogger.org/tusosowamosawilemezu.pdf
    • https://static.s123-cdn-static.com/uploads/4413980/normal_5fdd406ded1cd.pdf
    • http://uscovidcharts.com/3456702057zk779.pdf
    • https://zogabugopevaluz.weebly.com/uploads/1/3/0/8/130814784/6481336.pdf
    • http://lnstagram-verifedbadge.com/the_motley_fool_uk_investment_guideu7bcy.pdf
    • http://lumacy.site/43907848744xlqeh.pdf
    • http://raisinsapp.club/47812637689krb0s.pdf
    • https://cdn-cms.f-static.net/uploads/4496815/normal_6041015b65e70.pdf
    • https://sonoredepi.weebly.com/uploads/1/3/0/9/130969061/nalosiroxemalew.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e1cf253b-b3af-4135-a675-1c3c021177f9.filesusr.com/ugd/111c46_d4e1f406b0d643308a330cddfdbdc1d4.pdf?index=true
    • https://ce099f17-eb12-430b-a452-8d789b3ee5a8.filesusr.com/ugd/aef5b7_8f58ae903c53481383d76d2b0380c86b.pdf?index=true
    • https://b01cffea-7a05-49e8-9781-04202a21c04b.filesusr.com/ugd/d5d855_d5f5f30c93e9405499dcaae7bc18e01f.pdf?index=true
    • https://2987c0f4-171e-4473-b3f1-a5468658115b.filesusr.com/ugd/75ff8a_45108a9ae9644f45935ab73ab410d369.pdf?index=true
    • http://tasefabomodewiv.epizy.com/35711640084.pdf
    • http://zulexesovo.epizy.com/calendrio_escolar_2020_portugal.pdf
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_20be574405d44072bce350ded1ba7407.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_off00012516.bin
d718f8d86b4d2ca2ba81b1e25b1a8e12831c9dc916c25271249e0157633fd399		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12516 5220 bytes
font_01_sfnt_off000136da.bin
f6ac57601e6b477e3bfd8e2c6f137c9f1d4b35907da04aed50cc173c9d902b50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136DA 11860 bytes

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