Malicious PDF — malware analysis report

Static analysis result for SHA-256 a51e8d20af90648c…

MALICIOUS

PDF

79.2 KB Created: 2021-03-28 10:19:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 39b653b5a4dc8941a8578978339c435d SHA-1: 54b6309b7d4bae3f259aaced2a0325bd7ca267cd SHA-256: a51e8d20af90648cbc253e7e30115d74c12ea843772005207e9766cbaf5ef830
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection scheme to distribute further malicious content. The presence of external URIs and the ML classification strongly suggest an attempt to trick users into visiting malicious sites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/wix?keyword=bc+rich+pro+x+custom+special+x3+mockingbird+review PDF link annotation
    • https://kiloroxo.weebly.com/uploads/1/3/0/8/130813762/5363702.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446166/normal_604f500add2bc.pdfIn PDF document text
    • http://wibetunutivemi.iblogger.org/lagu_anywhere_like_this_say_ups.pdfIn PDF document text
    • https://cdn.sqhk.co/dogutadova/heghic2/sports_games_to_play_3d_racing.pdfIn PDF document text
    • https://cdn.sqhk.co/gazegarov/hAgjgfU/sopezokub.pdfIn PDF document text
    • http://vazamewugox.22web.org/sony_str-dn1030_7.2_av-receiver.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489979/normal_604e59d127a30.pdfIn PDF document text
    • https://dexasarejujevi.weebly.com/uploads/1/3/1/4/131454537/ravimirodif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380380/normal_603fa1ad2c68b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478688/normal_5fc704c356bf8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488137/normal_5fe25b72d11fe.pdfIn PDF document text
    • https://fidumozif.weebly.com/uploads/1/3/4/7/134715024/kirav_jurotew.pdfIn PDF document text
    • http://gtmedis.com/what_are_some_confused_wordst7ye6.pdfIn PDF document text
    • http://topdiscount.pro/mefarijisulimenumutuxukathmvke.pdfIn PDF document text
    • http://itash.space/bcps_study_guidecg62w.pdfIn PDF document text
    • http://hookup153.site/puluperusesolomalarexx76t5.pdfIn PDF document text
    • http://bonboxstudio.com/86147559149p4m7q.pdfIn PDF document text
    • https://pivufuzonopovi.weebly.com/uploads/1/3/4/5/134588588/bezoligezoda-wipokajaz-turunuwimusu-vilata.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pijiwir.rf.gd/titutuvimolipezujirif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57a84cab-5074-451d-ab81-4f082026d88d/68027289764.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/186db99a-3edd-4e75-8ee4-b1d321c61d9d/gaverosejexedurilarujatit.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF415 6124 bytes
SHA-256: 30f4d25a211343bd1b04a939e43094a5bea78930c8cf3cecbc2c4acbd5268206
font_01_sfnt_off000108cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CD 11176 bytes
SHA-256: fa84414108413f938c1fea5a3811d3e26475dda95fffef80c305a5657f380913

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