Malicious PDF — malware analysis report

Static analysis result for SHA-256 c03cd71d5e58eeca…

MALICIOUS

PDF

90.3 KB Created: 2021-02-24 12:33:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5c48b04d6aaa53e6f413195d32bcd372 SHA-1: 2aa2fa36e17b7b556bdf2643971dd6b6a61a84b8 SHA-256: c03cd71d5e58eecaf8381fcd85ed933c0b610d08b722720618fc2c1a5969819e
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable domains and Weebly-hosted PDFs, indicating a link farm or SEO manipulation tactic. The presence of an invisible link to 'securitycheckingbrowservkcom.xyz' and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://jottigo.ru/wix?keyword=obliged+synonyms+in+hindi PDF link annotation
    • https://lobekopaxukibo.weebly.com/uploads/1/3/1/4/131453735/kavotodosi.pdfIn PDF document text
    • https://rixotojar.weebly.com/uploads/1/3/0/9/130969533/sinoxovavamaf.pdfIn PDF document text
    • https://rupogasonewu.weebly.com/uploads/1/3/4/6/134653860/gulifametadexalov.pdfIn PDF document text
    • https://cdn.sqhk.co/savunowudob/jQwXjb7/bmc_buckets_facebook.pdfIn PDF document text
    • https://vanimiravupu.weebly.com/uploads/1/3/2/7/132710567/2395974.pdfIn PDF document text
    • https://vezijukifi.weebly.com/uploads/1/3/3/9/133997169/238f5.pdfIn PDF document text
    • https://cdn.sqhk.co/ribobujir/vifije2/lyrics_colors_of_the_wind_disney_themes.pdfIn PDF document text
    • https://cdn.sqhk.co/vasegodesazu/5qsjehf/coin_pusher_game_app_ios.pdfIn PDF document text
    • http://securitycheckingbrowservkcom.xyz/vinuzavejizixakuvspzr.pdfIn PDF document text
    • https://cdn.sqhk.co/fujonexa/Z5pQSnc/shopping_mall_girl_dress_up_games.pdfIn PDF document text
    • http://skidki-day.store/alfred_piano_book_4jlqdk.pdfIn PDF document text
    • http://wagajij.22web.org/73950274054.pdfIn PDF document text
    • https://cdn.sqhk.co/vegedusovo/hMKBgix/duzexewafupiki.pdfIn PDF document text
    • https://cdn.sqhk.co/romilononove/Dgiihc5/41649301174.pdfIn PDF document text
    • https://fidojosamesevuf.weebly.com/uploads/1/3/4/5/134594598/1512858.pdfIn PDF document text
    • http://coolvdomaion.online/heavy_rain_trophy_guide_walkthroughr1oxt.pdfIn PDF document text
    • https://cdn.sqhk.co/gozajare/GhchNhb/66633606934.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFD 5204 bytes
SHA-256: e8db403dfaf19a2849cb98a70ecfbb1ec5b95ee2b8b143e6538396695e4c6d31
font_01_sfnt_off0000f186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF186 3720 bytes
SHA-256: d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280
font_02_sfnt_off0000fce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE9 10508 bytes
SHA-256: db4f79bd388baa8ffa633e83aa171a70f96937b9fa8f7ef80766aa5d6fc6bc38
font_03_sfnt_off0001211f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211F 16064 bytes
SHA-256: 6f17b99764d671a96c0d2fd0b5f339513c2ddbf7efa5d755f63b897ad21dd613
font_04_sfnt_off000135ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135EA 10808 bytes
SHA-256: 052df58ba2b4e584b57f53d4c3da9abb91246369fd64b06a8fd85bcfdab1ce3a

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