Malicious PDF — malware analysis report

Static analysis result for SHA-256 70ff867501ed674f…

MALICIOUS

PDF

73.3 KB Created: 2021-02-20 18:51:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f27a884ace50b64a37df81ce002b7a68 SHA-1: df02aac59d8ab6ae43c947a9cfacc902fe879dbd SHA-256: 70ff867501ed674f3adc663fbceb5ea88d1446ebcc4d1a53c5ed45441b68040b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, flagged as a link farm, and is identified as malicious by ML classifiers and ClamAV. The document body, though heavily obfuscated, suggests a lure related to technical specifications, likely to trick users into visiting malicious URLs. The presence of embedded URLs and the PDF_URI heuristic indicate attempts to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://druttle.ru/strik?utm_term=dell+latitude+e7450+i7+5th+generation+8gb+ram+specification PDF link annotation
    • https://cdn.sqhk.co/rewakevutel/eihVjfQ/jabula.pdfIn PDF document text
    • https://cdn.sqhk.co/nikajovefer/ijfhbmj/gaxikagapiwagadifubani.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387037/normal_5fcbd55e01718.pdfIn PDF document text
    • https://volejodanuba.weebly.com/uploads/1/3/4/5/134593723/9528737.pdfIn PDF document text
    • https://cdn.sqhk.co/wosuzumamig/hhiggjz/one_gotta_go_food_meme.pdfIn PDF document text
    • https://cdn.sqhk.co/xivovido/4jd3f6k/co_bylo_grane_w_4fun_tv.pdfIn PDF document text
    • https://cdn.sqhk.co/togokitaz/iaAjfIK/learn_javascript_offline_tutorial_apk.pdfIn PDF document text
    • https://tivuwamivubi.weebly.com/uploads/1/3/5/3/135384825/xaxidimozu.pdfIn PDF document text
    • https://tamoxukezoge.weebly.com/uploads/1/3/4/5/134585929/318829.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460473/normal_60267a773f578.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kiremefegonar/57528125812.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/sefotedikepajesijorebino.pdfIn PDF document text
    • http://duwimufowewis.epizy.com/how_to_say_answer_me_in_french.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/seismic_performance_of_exoskeleton_structures.pdfIn PDF document text
    • https://s3.amazonaws.com/bejikefowu/macos_catalina_clean_install.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/najozurojinowu.pdfIn PDF document text
    • https://s3.amazonaws.com/juwofuxufijup/newilovezakuxek.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC995 6336 bytes
SHA-256: ef18fc88d1161a10541807816850f1ae643e3ec9b702f654ab38404b6ba0b375
font_01_sfnt_off0000df08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF08 10172 bytes
SHA-256: 79790d5dc1d2fae3ca621bbd310e2930fde79addd05c076558bab0196cb38a6b
font_02_sfnt_off00010234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10234 16164 bytes
SHA-256: ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8

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