Malicious PDF — malware analysis report

Static analysis result for SHA-256 e373d61c09b17e00…

MALICIOUS

PDF

68.1 KB Created: 2021-03-15 15:46:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 85bb9c7cdfead6cf9769cb531e7d76b7 SHA-1: 5364625e87cb2535a211aa6e4c98987d7db99c6a SHA-256: e373d61c09b17e00b8cde94b46a1daf1d9e5a1e0af123d11ea6bc1ec7a3eec3c
156 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which are SEO-optimized and point to potentially malicious domains. The primary URL, 'https://resalured.ru/wix?keyword=amsco+ap+world+history+2020+pdf', suggests a phishing or scam attempt disguised as a search result. ClamAV and ML classifiers also flagged this file as malicious, indicating a high likelihood of a phishing or trojan payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://resalured.ru/wix?keyword=amsco+ap+world+history+2020+pdf
    • https://gerugufudob.weebly.com/uploads/1/3/4/8/134869234/1413608.pdf
    • http://fesufobototezer.mywebcommunity.org/pc_wireless_gaming_receiver_for_xbox_360_controller_not_connecting.pdf
    • http://rubyshup.space/3089733428iw29r.pdf
    • https://xedowekogo.weebly.com/uploads/1/3/4/6/134609622/viwokewogupumad.pdf
    • http://reduslimitalia-oficial.site/valkyrie_profile_android_apk_modtdntn.pdf
    • http://italysummer.fun/how_to_write_a_procedural_text_youtubewh1hk.pdf
    • http://nejupike.mygamesonline.org/77904693517.pdf
    • https://lekorasosin.weebly.com/uploads/1/3/4/6/134612915/ce129a8bacb7e4.pdf
    • http://guditoresuz.22web.org/62825672116.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d9833b20-bf48-4b50-8bb6-ca2536d27eba/how_much_oil_does_my_predator_6500_generator_take.pdf
    • https://3ae4d138-4ba3-4962-98fb-1b98b40a6a82.filesusr.com/ugd/38062a_d8d6c3e7a8e74848ac58b9eb94f4765e.pdf?index=true
    • http://xikexugisomap.rf.gd/86799280433.pdf
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_f4e12529325e4926bb862d1ce4ff53cb.pdf?index=true
    • https://91e55214-10ad-44cf-a10a-60a9392df58b.filesusr.com/ugd/e1c37d_84596f9550814a6ba3044bd60c0754d2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e71d9c9d-6bf2-4fee-a538-eb600dfa33a7/what_is_the_biblical_evidence_of_purgatory.pdf
    • http://kusukod.epizy.com/60138173648.pdf
    • https://f8ba888e-8f71-4fde-8303-550399648f4e.filesusr.com/ugd/17ce20_7a043d4955d44de69aee785563f6f5cd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6f78f67e-c9ed-4c5f-b499-035926c389fe/5955109654.pdf
    • http://kiwusegofavuto.rf.gd/4539904391.pdf
    • https://uploads.strikinglycdn.com/files/fcc074c8-d75a-45f7-903e-ede50f3554b8/is_the_cadillac_3.6_a_good_engine.pdf
    • http://muvekalufisu.atwebpages.com/niluroside.pdf
    • https://uploads.strikinglycdn.com/files/f396d79c-a455-4938-952e-50e076bf7d74/rak_bank_letter_of_credit_charges.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c996.bin
e96217f37244d3e243e9d11a5a94614525a572599e5c02e815c06a3146dd1fb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC996 5852 bytes
font_01_sfnt_off0000dd6e.bin
e273dbcd4e343f9cf189446a2bc9cacb21c4f698ed341b2ea950125d901733e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6E 10440 bytes

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