Malicious PDF — malware analysis report

Static analysis result for SHA-256 e160c17d6b99cb89…

MALICIOUS

PDF

121.5 KB Created: 2021-04-17 12:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7327ddb2ece2bb5b69adaa07da979b71 SHA-1: 33209e0fdc4707490260d7c800bd7fd7bb55d2b9 SHA-256: e160c17d6b99cb894a6f26f8904b698bc1b8f7c4b47fd64bc0ac3e782b6b715e
96 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and is flagged by ClamAV as a phishing trojan. The ML classifier also strongly indicates maliciousness. The document body, though heavily obfuscated, appears to be a lure related to 'Aircare humidifier error codes', directing users to a suspicious URL for further interaction. No scripts were extracted, but the presence of external URIs and the overall detection profile suggest a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 4

  • 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://xezojetit.ru/strik?utm_term=aircare+humidifier+error+codes
    • https://cdn.sqhk.co/xamitarerivu/gigjjbT/12934488393.pdf
    • https://cdn.sqhk.co/dalubevemex/a3zjche/uefa_champions_league_final_2020_on_tv.pdf
    • https://cdn.sqhk.co/lagusive/gjj6Mt1/34.pdf
    • https://cdn.sqhk.co/nimabugokofa/jibw5GH/39981645798.pdf
    • https://cdn.sqhk.co/fumodolanes/hchcjep/defense_zone_original_unlimited_money_apk.pdf
    • https://cdn.sqhk.co/xenaporo/LiaZRY3/91109964588.pdf
    • https://cdn.sqhk.co/fudamozomeb/hhbjc2S/73317129117.pdf
    • https://cdn-cms.f-static.net/uploads/4468540/normal_6067347adc447.pdf
    • http://micrometer25bill.site/usps_local_mail_delivery_timei14rp.pdf
    • https://cdn.sqhk.co/fuwufupi/0CUopiz/bronze_age_tools_ks2.pdf
    • https://cdn-cms.f-static.net/uploads/4370764/normal_605551147a606.pdf
    • https://cdn.sqhk.co/seworani/h3gichd/how_to_make_boom_cards_speech_therapy.pdf
    • https://cdn.sqhk.co/xolizoxime/nHhzFid/report_littering_singapore.pdf
    • https://cdn-cms.f-static.net/uploads/4386839/normal_606e736cd598f.pdf
    • http://sdek-24.cc/13083635262hwzro.pdf
    • https://static.s123-cdn-static.com/uploads/4479705/normal_6006266716f3a.pdf
    • https://cdn-cms.f-static.net/uploads/4458833/normal_60257f94373bd.pdf
    • https://cdn-cms.f-static.net/uploads/4423443/normal_603f99d5a6c7e.pdf
    • https://cdn-cms.f-static.net/uploads/4389606/normal_6063f21dce1f5.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016763.bin
feddb075de3d0f14084716d1fa50bfc2c99d387704eebd0afb4d64786ab9b329		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16763 1748 bytes
font_01_sfnt_off00016fd0.bin
7c5c2323d59f855b4ae360a095157e8c2dc12497e795fd34bcce90fcdc858e82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16FD0 5160 bytes
font_02_sfnt_off000181c4.bin
f068d4a20534d025f98c557bed394730b7f0d23519ba558af9ad46ca0d08c70c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x181C4 5220 bytes
font_03_sfnt_off0001935b.bin
fca42e75545bf7d699a340083cd826de3ec999c332393c0df9757680f0c51dce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1935B 15208 bytes
font_04_sfnt_off0001c231.bin
4cc2f582b2d433aead1a6fec0018de819dae8b9c073655edfd1779ecb4a0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C231 16116 bytes

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