Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0c30e1fbf6bb0d9…

MALICIOUS

PDF

69.9 KB Created: 2021-02-24 01:22:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a8524c10355fdb4a89e6cf6f6f3ab451 SHA-1: 2abbd041085760169195000898200fdd36be189c SHA-256: c0c30e1fbf6bb0d957be580a635255cd0606ca6744686c79db08a52c2b4f77e0
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, suggesting it functions as a lure or phishing document. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a pattern of using disposable hosting for such links, reinforcing the malicious nature.

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
  • 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.
  • 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://baarspo.ru/wix?keyword=cellular+respiration+worksheet+answers PDF link annotation
    • http://joxorapux.22web.org/deool_band_mp3_ringtone_free_download.pdfIn PDF document text
    • https://koropiliful.weebly.com/uploads/1/3/0/7/130740252/gerima-sidomomewazadu-kokataxibobenu.pdfIn PDF document text
    • http://vovidumuf.22web.org/28354907087.pdfIn PDF document text
    • https://cdn.sqhk.co/kadukugobug/exAGzjh/wosipex.pdfIn PDF document text
    • https://cdn.sqhk.co/zifeduwa/eRFkieW/47058473400.pdfIn PDF document text
    • https://xotozefubineru.weebly.com/uploads/1/3/4/5/134576546/zaxunexokubetali.pdfIn PDF document text
    • https://cdn.sqhk.co/lepudijazur/3gdgejg/jexowivuzasulide.pdfIn PDF document text
    • http://gidomepijamasos.iblogger.org/best_daphne_moon_quotes.pdfIn PDF document text
    • https://cdn.sqhk.co/murafabu/jfehaha/53263866123.pdfIn PDF document text
    • https://boviseweduxiraz.weebly.com/uploads/1/3/0/7/130776594/fodaxe.pdfIn PDF document text
    • https://cdn.sqhk.co/safubuguva/EoBZIhi/jipoga.pdfIn PDF document text
    • https://cdn.sqhk.co/delojiwuguj/j7KBieI/96007946170.pdfIn PDF document text
    • https://cdn.sqhk.co/nulaliki/jchNVje/werewolf_costume_walmart.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
    • http://xonafalapon.epizy.com/39930433509.pdfIn PDF document text
    • http://pexuxiwug.rf.gd/kirogupibovikadoxaweto.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_off0000cab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB8 4968 bytes
SHA-256: 9bd2989cdea6cd3e7b1487e1b68b2f12ed0ab55fc4f7332c14408944f48dcf93
font_01_sfnt_off0000dba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA2 9488 bytes
SHA-256: 4a6555eceb2d2f6b3eb9aeff04e4c494d2d97b48a1ce47730ff534835f27e114
font_02_sfnt_off0000fc07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC07 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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