Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ca6a1c498a19e7d…

MALICIOUS

PDF

75.1 KB Created: 2021-02-14 05:01:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 9de58874f4197324448eb62a281810e9 SHA-1: 655ae2a6d239833ac76f08515dcf9b34840dfa6a SHA-256: 2ca6a1c498a19e7d62d2ec62a0b32fbd59b3103afabfe958ecdf0646987fe72e
206 Risk Score

Malware Insights

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

The PDF contains a malformed exploit stream and numerous embedded URLs, indicating malicious intent. Heuristics like 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' suggest the document is designed to redirect users to a large number of external sites, likely for phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://seumenha.ru/123?utm_term=what+does+highlighted+comment+mean+on+youtube%25EF%25BF%25BC PDF link annotation
    • https://wokoxulepimam.weebly.com/uploads/1/3/1/4/131438011/nokejefezosifusuk.pdfIn PDF document text
    • http://mopafebofin.22web.org/88412185168.pdfIn PDF document text
    • https://cdn.sqhk.co/lupokuna/vgujgif/95280869366.pdfIn PDF document text
    • https://gitasojozatoj.weebly.com/uploads/1/3/0/9/130968906/7593228.pdfIn PDF document text
    • https://razotipelemato.weebly.com/uploads/1/3/0/7/130738732/xisixaseduzawerob.pdfIn PDF document text
    • https://cdn.sqhk.co/vefusujix/yibsDDt/champions_league_stars_logo_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/wuwexosul/Thfghge/cotton_classing_codes.pdfIn PDF document text
    • https://cdn.sqhk.co/dokukavifig/3hghhCG/oceans_lite_board_game.pdfIn PDF document text
    • https://cdn.sqhk.co/wufevinek/icjb4bO/okay_kaya_bandcamp.pdfIn PDF document text
    • https://cdn.sqhk.co/xilasexiki/fvgcDEh/zoratolugosinuzarazo.pdfIn PDF document text
    • https://nodokesomizi.weebly.com/uploads/1/3/4/6/134656280/9475759.pdfIn PDF document text
    • https://tiguziriwisil.weebly.com/uploads/1/3/1/0/131071210/jonoba-sagefebujujefag-lesizibopoben-xowigo.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/numunenoji/mcafee_antivirus_free_for_windows_10.pdfIn PDF document text
    • http://gakopukikix.rf.gd/fozofetozolizerufebepol.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/clash_of_clans_online_play_no.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_off0000db79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB79 5400 bytes
SHA-256: 5d0724c25fad63db64f7866cee5abc76d75b19e1cc99fb6519181f12d6283a43
font_01_sfnt_off0000edc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC8 9556 bytes
SHA-256: bda1b438c6db57f582cafe6d61bbf41813ca4891428c37b8cc1aacc172d34c71
font_02_sfnt_off00010e62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E62 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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