Malicious PDF — malware analysis report

Static analysis result for SHA-256 a40ac47a0138cb23…

MALICIOUS

PDF

78.5 KB Created: 2021-02-22 15:49:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 12a2b256b1b50110a4b82bb043ddf0f7 SHA-1: a041c8c2b9d17374ce73597c3107a74dae8191f1 SHA-256: a40ac47a0138cb23052c87697e9e8b9c43530c915349870f87e8080cec1c3b9d
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, indicating it likely serves as a phishing or redirection lure. The document contains a large number of embedded URLs, many pointing to disposable hosting or known redirector infrastructure, designed to lead users to malicious sites. The presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content broadly.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://yafferge.ru/wix?keyword=fresh+berry+pie+with+graham+cracker+crust In PDF document text
    • https://rukupapafi.weebly.com/uploads/1/3/0/7/130739745/nulas-wajokewirilap-nogigimi.pdfIn PDF document text
    • https://cdn.sqhk.co/lebudawojafi/WojageW/vokajugokov.pdfIn PDF document text
    • https://cdn.sqhk.co/kivutuzo/JvjdhiT/58513397995.pdfIn PDF document text
    • http://fruit-citrus.space/26760699950a2pw3.pdfIn PDF document text
    • https://cdn.sqhk.co/sebixodof/eIUjasc/diners_club_south_africa_ceo.pdfIn PDF document text
    • https://balesiloruj.weebly.com/uploads/1/3/4/6/134671801/3175469.pdfIn PDF document text
    • https://lagukowimewalis.weebly.com/uploads/1/3/5/3/135335318/tasafuwekuwitaxas.pdfIn PDF document text
    • http://mkr-olimp.info/temerekusewulinozdsu49.pdfIn PDF document text
    • https://cdn.sqhk.co/rapawaferew/jhhhehh/archery_master_3d_hack_mod_apk_free_download.pdfIn PDF document text
    • https://fekazivijiwawad.weebly.com/uploads/1/3/4/6/134687088/liwoxeg-mopakezezire.pdfIn PDF document text
    • http://afracheat8.xyz/embird_crack_2018uhszb.pdfIn PDF document text
    • https://cdn.sqhk.co/gusiloxi/ihM2YxG/wepewozisowukimizotasapib.pdfIn PDF document text
    • http://giocodigital.website/wuzisabovekuxoy2r5z.pdfIn PDF document text
    • https://cdn.sqhk.co/sekopanosesu/h3ficSD/layton_brothers_mystery_room_ost.pdfIn PDF document text
    • https://cdn.sqhk.co/senepaderu/gJifhgU/zumevojaloziz.pdfIn PDF document text
    • http://redit.fun/hello_dolly_movie_castrambp.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/lebaxa/instagram_for_windows_7_desktop.pdfIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/23892846290.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/6010030623.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/47085395446.pdfIn PDF document text
    • https://s3.amazonaws.com/bodajaku/negative_questions_examples_and_answers.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_off0000f5e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E7 5668 bytes
SHA-256: ec125cf22e8e15c74ef9a11cae96bc9c0d70fdba193f620ef13a7f8fde6d1f2b
font_01_sfnt_off00010920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10920 10364 bytes
SHA-256: 3f3827f4977d62f72308b5b52ecf855ef2b79232ffc301843158f04b2e36c47a

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