Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f66a1b3d5a687be…

MALICIOUS

PDF

87.4 KB Created: 2021-04-29 11:28:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 44c666d09425fae59afd375b556ec20f SHA-1: 53c63c223b31a00ea4222151ee0239e4e903605a SHA-256: 5f66a1b3d5a687be5911b348862f24cc4c9394878850a77995a6c801af013ca9
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://zajinet.ru/strik?utm_term=how+to+get+a+free+criminal+background+check+on+someone PDF link annotation
    • https://cdn.sqhk.co/bigulikexupa/gkdsigX/zixopopogopubumufipaf.pdfIn PDF document text
    • https://denowulak.weebly.com/uploads/1/3/3/9/133997299/5335253.pdfIn PDF document text
    • https://larekupexog.weebly.com/uploads/1/3/4/8/134884129/6350739.pdfIn PDF document text
    • https://cdn.sqhk.co/jorafulati/ieihcia/hedwig_s_theme_guitar_sheet_music.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwumixe/hgy3wjb/15596192469.pdfIn PDF document text
    • http://supozupewurak.22web.org/devasidufevupoginut.pdfIn PDF document text
    • http://momivegod.22web.org/jifusefegepex.pdfIn PDF document text
    • https://xodozevonewoze.weebly.com/uploads/1/3/1/3/131384462/vowira.pdfIn PDF document text
    • http://jixaravaxagisuf.22web.org/nuturuxejibeju.pdfIn PDF document text
    • https://tatabano.weebly.com/uploads/1/3/4/8/134850833/9141140e1c720.pdfIn PDF document text
    • https://xepevuke.weebly.com/uploads/1/3/0/7/130775471/ba4944.pdfIn PDF document text
    • https://cdn.sqhk.co/vopofuxo/FiAqKij/monkey_grass_sidewalk_border.pdfIn PDF document text
    • https://cdn.sqhk.co/najadiwun/gj1jF6V/18396315365.pdfIn PDF document text
    • https://jowatoziji.weebly.com/uploads/1/3/4/8/134893097/digegimibupuvaf.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/turip/43664037907.pdfIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/bisoteteviwi.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/healthy_boundaries_worksheet_for_youth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38bb6fa7-331c-40ef-b781-32339a927229/the_talented_tenth.pdfIn PDF document text
    • http://munowesixebo.rf.gd/9228211217.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/998b706b-c353-419d-8cbd-c718d1aa4a91/vw_tiguan_manual_gearbox_oil_capacity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f780ddd-c37c-4aa2-88a5-752bf88216e4/tc_polytune_3_mini_dimensions.pdfIn PDF document text
    • https://s3.amazonaws.com/genukopapovixo/94207352619.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/54252044110.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1C 5692 bytes
SHA-256: 0dbdc280231ebc967fe5d4a79a7fde4f6f691e57f8a0b7f56de6d68057b978fe
font_01_sfnt_off00011168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11168 11180 bytes
SHA-256: 284ed0b8813d5175a1b0ebf35f3933d0af6a1a90124bb9c2e1ceb6ee58a073ed
font_02_sfnt_off000137f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137F5 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e

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