Malicious PDF — malware analysis report

Static analysis result for SHA-256 f819a125921bc234…

MALICIOUS

PDF

76.3 KB Created: 2021-03-14 09:18:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce4ceea188567af10d82c0643fbe6ef6 SHA-1: 70e7741271922db93324e17e6207d5bf349c8128 SHA-256: f819a125921bc234d48c866a24ba8524319e1ad271e3c911615ae15e3d5c7740
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

This PDF document exhibits characteristics of a phishing or social engineering attack, specifically a 'ClickFix' variant. It contains a large number of external links, many of which point to other PDF files, suggesting a link farm designed to improve search engine rankings or distribute malicious content. The presence of the URL 'https://soxebez.ru/123?utm_term=bitdefender+ransomware+removal+tool+free' indicates a lure related to security software, aiming to trick users into downloading further payloads. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://soxebez.ru/123?utm_term=bitdefender+ransomware+removal+tool+free
    • http://copyrightsupporthelpcenter.com/tasazubixuloguzorulxjwzl.pdf
    • http://herss.space/47045793068waat4.pdf
    • http://letgtma.bid/184684468821llgy.pdf
    • https://kejojotevunujip.weebly.com/uploads/1/3/1/8/131871587/ea29d.pdf
    • http://bcipreactivaperu.com/how_to_install_a_basic_honeywell_thermostatoedmq.pdf
    • http://garagodubowixa.iblogger.org/93448932517.pdf
    • https://defeluzeveloj.weebly.com/uploads/1/3/0/8/130873982/7951165.pdf
    • http://torchqbfl.fun/how_to_reset_a_honeywell_thermostat_schedulek0v45.pdf
    • https://lewezuwarekizes.weebly.com/uploads/1/3/4/0/134040914/8fbb0.pdf
    • https://fotofewoxa.weebly.com/uploads/1/3/4/8/134849098/xutomifalon-mavesizu-pojodi.pdf
    • http://bamimutekinawaz.22web.org/business_math_exercises.pdf
    • http://hookup753.fun/vizio_e600i-b3_main_boardhonl0.pdf
    • http://toolsbestpricemicrometer.site/44729654289wn4g5.pdf
    • https://fixaninupokawaw.weebly.com/uploads/1/3/0/8/130873986/nojulagom.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_944a78b18280446b86eac801229de84d.pdf?index=true
    • https://748f1d53-d141-46c1-926a-d14fc69713a3.filesusr.com/ugd/e3ed1f_e8a6a391e126448da7f01fd54852ff1b.pdf?index=true
    • https://e25b5f36-ee09-4010-8803-019b2853a23b.filesusr.com/ugd/c34eac_61fc1c7d7c234a60950b8c704171f715.pdf?index=true
    • https://18cb0a1d-3822-48a5-9ca0-56465202bc9b.filesusr.com/ugd/96564c_16ae3766accf4a32a56afabc6cdeb143.pdf?index=true
    • https://a3c35cc3-4a3f-4d41-ab51-8b3e4b114d30.filesusr.com/ugd/2b25b5_ec1eb9794b314219a02b64050751ed59.pdf?index=true
    • http://rakemexovujepez.epizy.com/administrative_science_quarterly_submission_guidelines.pdf
    • https://4abf464d-34d5-4c80-8de5-e64f30e04530.filesusr.com/ugd/8b3eb5_61f46c9ebb4e4e40ac52bad182102708.pdf?index=true
    • https://9d349da1-218b-4b59-9e37-2a90cab56d40.filesusr.com/ugd/de9003_8e27815a54464286a86f5e28b9d4e8e4.pdf?index=true
    • http://noxudovo.rf.gd/21375331583.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_off0000ec56.bin
ac4763c1688ef9af5363b8396762ac26cc96ae4b510d86fc315ec5deee92ecf7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC56 5252 bytes
font_01_sfnt_off0000fe35.bin
6035e3c80566b6b9ba572981cd143f9530976fa7e9b5332f1ba985334e186046		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE35 10980 bytes

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