Malicious PDF — malware analysis report

Static analysis result for SHA-256 f283c22a1ef82e98…

MALICIOUS

PDF

81.1 KB Created: 2021-04-13 11:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4f68f42c9a03f9f922b610aaf58457ba SHA-1: 1c320c91601b958328a15b021f8b11360d4e5e76 SHA-256: f283c22a1ef82e988ee145fe8f547303323aab5f89a9df82eacfd5d76fe1292d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1105 Ingress Tool Transfer

The PDF contains a large number of external links, many of which are suspicious, suggesting a link farm or phishing attempt. The 'SE_CALLBACK_LURE' heuristic indicates the document may be designed to trick users into calling a fraudulent support number. While no scripts were explicitly extracted, the PDF structure and numerous external links strongly suggest it's intended to redirect users to malicious sites for phishing or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://botokaw.ru/strik?utm_term=how+to+use+a+sears+battery+charger PDF link annotation
    • http://springital.fun/gololimus23mf.pdfIn PDF document text
    • https://cdn.sqhk.co/rilowikapaz/yJibjfz/evil_nun_scary_horror_game_adventure.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • https://cdn.sqhk.co/jimevexir/UhdHgf4/freeget_app_invite_code.pdfIn PDF document text
    • https://cdn.sqhk.co/tixuniwe/WgEjhyZ/25770701894.pdfIn PDF document text
    • https://cdn.sqhk.co/sepunaro/8iiibme/bounce_network_on_spectrum.pdfIn PDF document text
    • https://cdn.sqhk.co/vinasujitupe/4iHgiQw/26786213579.pdfIn PDF document text
    • https://cdn.sqhk.co/sapasimemo/PYghjiq/50658007016.pdfIn PDF document text
    • https://cdn.sqhk.co/minofavazu/ijggdkV/naripijurusudofawoxa.pdfIn PDF document text
    • https://cdn.sqhk.co/pixafosabow/hju1ggl/mirrors_of_albion_questions.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/lowuwofuxali/prime_video_android_tv_apk_mirror.pdfIn PDF document text
    • https://d451e762-8e00-4155-9971-9512d28d2528.filesusr.com/ugd/b52961_da88a47a1b644eec8061f7c287a87ac2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/redegelesibif/avg_free_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/wupuxus/39154020473.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/fillable_5e_character_sheet.pdfIn PDF document text
    • https://be8414c4-f2d5-40c6-b8a8-1a5561a1dac7.filesusr.com/ugd/a452ea_57176f91d8614b7eb8dd49dbe50c1162.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mubefula/what_were_the_most_important_themes_in_world_history_from_1919_to_1939.pdfIn PDF document text
    • https://75ca6b5e-a470-4e0e-8004-b00a9f1721b4.filesusr.com/ugd/1e4819_b599782b77144b15a0316ffa32fa0605.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/nefizazufiwu.pdfIn PDF document text
    • https://e61e9f85-32c5-4861-9fd4-b89109084c35.filesusr.com/ugd/2e4eb4_0955510fcea7487ea733bfbeecff0075.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/pradhan_mantri_awas_yojana_in_gujarati.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_off00010073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10073 5324 bytes
SHA-256: 76b9527fce39fb80300911ae8253c028993ceada37c723fd57163316ff8ca490
font_01_sfnt_off000112a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A2 10684 bytes
SHA-256: 2aba95302455ee2fb7bfb8119b49e6806ea62996aedbf5ceaa114ea50c34413b

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