Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa958ecc7c644c1a…

MALICIOUS

PDF

77.7 KB Created: 2021-02-20 22:53:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cff75fbb68c219ff92f2c320bd4f000b SHA-1: 9799a6f61b34d1e6476943d54dfee885a62d71f6 SHA-256: fa958ecc7c644c1af9ad273e2b5c43f034d6ee5d8fc21da7bebfa9e5e18d71cf
214 Risk Score

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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://yafferge.ru/wix?keyword=monster+hunter+world+trainer+wemod In PDF document text
    • https://tunomofezu.weebly.com/uploads/1/3/2/3/132303147/8439570.pdfIn PDF document text
    • https://cdn.sqhk.co/gupuwiwi/Qo08Vjj/27245721836.pdfIn PDF document text
    • https://cdn.sqhk.co/rasirise/gBkhev3/dancing_road_color_ball_apk.pdfIn PDF document text
    • https://fivarebaxuru.weebly.com/uploads/1/3/5/3/135326201/826025.pdfIn PDF document text
    • https://cdn.sqhk.co/furafurume/hh7PO4S/dovawefetuwas.pdfIn PDF document text
    • https://cdn.sqhk.co/kekumumaxow/y7jgjj5/how_to_iron_shirts_without_an_ironing_board.pdfIn PDF document text
    • https://cdn.sqhk.co/bamosabubesi/agiIAje/timapotipamitafuxumesus.pdfIn PDF document text
    • http://file-id.ru/toddler_room_daily_report38xpd.pdfIn PDF document text
    • https://cdn.sqhk.co/tinawegu/jhaji2T/charades_words_generator.pdfIn PDF document text
    • https://cdn.sqhk.co/gebemiwisero/jxidii1/sifalolezogetumoxarus.pdfIn PDF document text
    • https://gekiwudev.weebly.com/uploads/1/3/4/7/134769606/ebc1848a6c5238.pdfIn PDF document text
    • https://reperitibomotij.weebly.com/uploads/1/3/1/3/131383541/7910720.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/fupanabivote/children_s_literature_ielts_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/vefinoga.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_off0000df00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF00 5044 bytes
SHA-256: 0bc9494abc2dca149c43079be61eba2edd6548a98c8186bdcb3a3f516c5d2d17
font_01_sfnt_off0000effe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFE 13756 bytes
SHA-256: 373160564ae36bad78968b3d8a3c52f3bb16b7cc8dd228ab693a9cea96683994
font_02_sfnt_off00011b83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B83 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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