Malicious PDF — malware analysis report

Static analysis result for SHA-256 44483c86cea8fb24…

MALICIOUS

PDF

87.8 KB Created: 2021-03-13 20:54:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 93358eb6a1e20ae2abb27a6f6ec9dc10 SHA-1: 5ea59a7808f173916a1020c559cb5c76017f06f9 SHA-256: 44483c86cea8fb2458ddfed81648ec1bb6026837620acf47d584cd9b4c85bc61
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to a link farm on disposable hosting, and the presence of UTM parameters in one URL further supports a tracking or redirection mechanism. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/123?utm_term=beginners+guide+to+running+long+distance PDF link annotation
    • https://rixemovupel.weebly.com/uploads/1/3/1/6/131606965/32b192cc485.pdfIn PDF document text
    • https://cdn.sqhk.co/pejozujemu/iW48Dhf/71695606294.pdfIn PDF document text
    • http://tafugegajotu.mygamesonline.org/how_much_do_physical_therapists_make_monthly.pdfIn PDF document text
    • https://wuxinaruniluxod.weebly.com/uploads/1/3/4/8/134882591/433068.pdfIn PDF document text
    • https://liloxowilobo.weebly.com/uploads/1/3/4/2/134265539/gowote-jopeti-tevibodowejebel-vazur.pdfIn PDF document text
    • https://cdn.sqhk.co/kogeledewafo/fXvDgfa/mowaganasunupolivike.pdfIn PDF document text
    • https://reponobokuwe.weebly.com/uploads/1/3/5/4/135401207/4618937.pdfIn PDF document text
    • https://fikakexuk.weebly.com/uploads/1/3/0/7/130775276/vakozoti.pdfIn PDF document text
    • https://cdn.sqhk.co/tovozovuzedu/c1hiwgh/dubib.pdfIn PDF document text
    • https://fevulawem.weebly.com/uploads/1/3/4/7/134714475/84a76.pdfIn PDF document text
    • https://cdn.sqhk.co/gujipiror/jjhe8jc/matchington_mansion_cheats_level_911.pdfIn PDF document text
    • https://vedexojofidas.weebly.com/uploads/1/3/4/5/134581268/ff0d94.pdfIn PDF document text
    • https://cdn.sqhk.co/tatidukigag/gAha2ia/vitamin_d3_deficiency_symptoms.pdfIn PDF document text
    • https://cdn.sqhk.co/xewazezikufi/f9bZjef/24248297126.pdfIn PDF document text
    • https://nelodukes.weebly.com/uploads/1/3/6/0/136085721/4860850.pdfIn PDF document text
    • http://sevowina.medianewsonline.com/sabapiwexokulawepelagiviz.pdfIn PDF document text
    • https://cdn.sqhk.co/balaragu/ItSJtje/birdy_gray_discount_code.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d696b71-36e4-4935-9969-ae1ff0e00f94/is_split_ticket_voting_common.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35467c47-3d39-47b1-8e11-274780b4806f/selenium_webdriver_interview_questions_and_answers_for_6_years_experience.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88dba806-015d-4ecc-895c-5281c003c1c7/sebixukezinuribujo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b362a9a-3b1f-43eb-85fd-6176e817644b/dikufedolokefuzigojuwok.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_off00011aa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA5 5156 bytes
SHA-256: 8261d85752c1beef2f37adb66b6e0ea7b37ccc32f193758ba9356fabbd462fe9
font_01_sfnt_off00012c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3F 10996 bytes
SHA-256: c8f27ca99551fb05528a9e2e035356a17290c890c3c30c951c6ac13f1337f6a2

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