Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b61d1c807c34584…

MALICIOUS

PDF

79.1 KB Created: 2021-02-17 05:26:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 02f9fa176a044f01eac2757d3a7f63dc SHA-1: d140dcce6f541b8f940fec6850c2dea758ebb545 SHA-256: 5b61d1c807c3458429838eecd76f67fb0af332ada97fda6f7a0f41feda6d9d84
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with critical heuristics indicating it's a malicious redirector and a link farm. One of the primary links leads to a known malicious redirector. The ML classifier and ClamAV detection strongly support a malicious classification, likely for phishing or malware distribution.

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
  • 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.
  • 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://crophysi.ru/wix?keyword=lord+of+the+flies+test+multiple+choice In PDF document text
    • https://cdn.sqhk.co/wikikifigas/jgf2hcR/aves_apoxie_sculpt_tutorial.pdfIn PDF document text
    • https://cdn.sqhk.co/kerosumumato/bRjhcjh/90s_music_r_b_artists.pdfIn PDF document text
    • http://ens-pictures.ru/742812780689v3z.pdfIn PDF document text
    • http://bubble1.space/loxajebonigedev43w6.pdfIn PDF document text
    • http://ighelpcenter.xyz/buzzed_drinking_game_cards8mrdf.pdfIn PDF document text
    • https://tuxutumixebapi.weebly.com/uploads/1/3/1/4/131438514/ferinujopukijarozepa.pdfIn PDF document text
    • http://sendgrid-de.com/92218824720ievi8.pdfIn PDF document text
    • https://gatelixepa.weebly.com/uploads/1/3/1/1/131163507/nenitijevi.pdfIn PDF document text
    • http://allostar.buzz/ez_go_golf_cart_manuallimv4.pdfIn PDF document text
    • https://toxafowusolele.weebly.com/uploads/1/3/2/8/132815148/9a63d6d8daae1d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/difference_between_meningitis_and_encephalitis.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/jira_customer_satisfaction_survey_report.pdfIn PDF document text
    • https://s3.amazonaws.com/fazujo/aqualung_bcd_size_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/69538332471.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/15403357707.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/telugu_movies_2018_free_3gp.pdfIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/bahubali_2_tamil_movie_tamilrockers._gr.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/vibration_fixture_design_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/acceder_a_icloud_via_android.pdfIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/gedepomubakifel.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADF 4900 bytes
SHA-256: 71e1c19cb7e39eaf0c6d44fca5227900f324ece3fe4b354ab6ec1e80d6878ed9
font_01_sfnt_off0000fb95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB95 10944 bytes
SHA-256: c4912725295a9b19538d9b3256ad8f1e7029d4cc93f4adefbcde75127cd61889
font_02_sfnt_off000120ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BA 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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