Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc0223d04e8de482…

MALICIOUS

PDF

78.2 KB Created: 2021-02-26 04:06:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 19d4831fd79befca2a4d34ec8734ec30 SHA-1: d21160e5fc7e2c49cba6335825907636ec72206a SHA-256: cc0223d04e8de482d7fa9e4ea1cda45c0b4c2ac72b94dbf34f857afd31813b3f
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links pointing to known malicious redirectors and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the presence of numerous suspicious URLs and the heuristic firings for malicious redirectors and link farms are sufficient evidence of a malicious attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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/award?keyword=beautiful+creatures+movie+quotes+love In PDF document text
    • http://neroveruturom.iblogger.org/whirlpool_duet_steam_washer_and_dryer_pedestals.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455886/normal_5fdbaa207c59b.pdfIn PDF document text
    • http://jiteruruw.sportsontheweb.net/bhagavad_gita_quotes_on_love_in_tamil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418180/normal_60074eaf4407c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366984/normal_5fc9d9cdf2c5a.pdfIn PDF document text
    • http://magnifioco.site/2994061217zl4yn.pdfIn PDF document text
    • http://joxexezukefu.22web.org/alexander_hamilton_new_york_times_book_review.pdfIn PDF document text
    • http://zugapuvu.mywebcommunity.org/sennheiser_xs_wireless_headset_mic.pdfIn PDF document text
    • https://cdn.sqhk.co/takularozo/hiegc8k/3587919699.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379043/normal_6007b34fec10c.pdfIn PDF document text
    • https://cdn.sqhk.co/kupawusel/hgftXih/medical_quiz_questions_and_answers_uk.pdfIn PDF document text
    • http://cucoupon.info/pastry_shop_business_planp4duz.pdfIn PDF document text
    • https://cdn.sqhk.co/dubutemaruxu/jeNhggg/spades_rules_for_8_players.pdfIn PDF document text
    • http://faxusupovetek.sportsontheweb.net/pubedobutimegemuvolo.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/gumegulaxi/1000_places_to_see_before_you_die_online_checklist.pdfIn PDF document text
    • http://zewedazogiwake.rf.gd/op._gg_euw.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/moximifateji.pdfIn PDF document text
    • http://gapisoga.rf.gd/wutig.pdfIn PDF document text
    • https://s3.amazonaws.com/xanunafojuloki/24766621162.pdfIn PDF document text
    • http://fafinonez.rf.gd/ati_proctored_exam_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jejulurowev/reservation_letter_format_for_hotel.pdfIn PDF document text
    • https://s3.amazonaws.com/povodijirig/gopajejoroxopokafis.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF594 5260 bytes
SHA-256: e054f93a0795cce69e165bf9de9dfdeacd07dbec6b58fd5c414b92adf4229300
font_01_sfnt_off00010772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10772 10540 bytes
SHA-256: c49a85c52505afa90b8d85332d5503a87a5da798c13f366708188800748b6869