Malicious PDF — malware analysis report

Static analysis result for SHA-256 61c1bd98084e1477…

MALICIOUS

PDF

72.6 KB Created: 2021-03-18 06:51:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 7ded91d348631b5630ce32367f5d53fa SHA-1: 014433fdb47110c4d734eb44de786ad30b7e7030 SHA-256: 61c1bd98084e14774ed2b5ab0d8413dc9ebfb2a67fbea1bb47449eb91e600f44
244 Risk Score

Malware Insights

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

The sample is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a PDF redirector and link farm. It contains numerous embedded URLs pointing to external sites, with at least one identified as a malicious redirector. The document body is heavily obfuscated and appears to contain metadata rather than user-facing content, suggesting the primary function is to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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.
  • 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://crophysi.ru/award?keyword=artificer+d+d+pdf In PDF document text
    • https://cdn.sqhk.co/rabuvimi/hdgchh1/vh1_app_roku.pdfIn PDF document text
    • http://kebakef.iblogger.org/determination_of_spring_constant_lab_report.pdfIn PDF document text
    • https://cdn.sqhk.co/voravaxa/hageiba/pac_man_arcade_game_for_sale.pdfIn PDF document text
    • http://tixokapine.mypressonline.com/bean_bag_chair_pattern.pdfIn PDF document text
    • https://cdn.sqhk.co/lilapanorup/GxHgiLy/dead_or_alive_6_save.pdfIn PDF document text
    • https://cdn.sqhk.co/pisomuma/haNXGhb/8159425634.pdfIn PDF document text
    • http://zipujesilan.22web.org/empirical_methods_in_finance.pdfIn PDF document text
    • http://nevinidonet.mywebcommunity.org/78368108161.pdfIn PDF document text
    • https://cdn.sqhk.co/dibidoretu/K1aTBhi/1196385929.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxedanafowa/b2dxC8l/my_android_tablet_is_too_slow.pdfIn PDF document text
    • http://zuduwamani.mypressonline.com/nerotuvesowagojew.pdfIn PDF document text
    • https://cdn.sqhk.co/fupokiwil/poieigJ/siwefimogidujo.pdfIn PDF document text
    • https://venolebibu.weebly.com/uploads/1/3/5/3/135348563/relosa_busifad_xaxiwok.pdfIn PDF document text
    • https://cdn.sqhk.co/xubuzivo/cLqgigc/37461854698.pdfIn PDF document text
    • https://nibowivuxewanu.weebly.com/uploads/1/3/1/3/131379040/829035.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://telifujovemevo.atwebpages.com/el_arbatel.pdfIn PDF document text
    • http://nafovivejaza.epizy.com/rujiwezezop.pdfIn PDF document text
    • http://bexovivuvere.myartsonline.com/samubujelawunoriti.pdfIn PDF document text
    • http://vekamodadon.onlinewebshop.net/99590057185.pdfIn PDF document text
    • http://wutesejib.onlinewebshop.net/76865968744.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_off0000e1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C1 4716 bytes
SHA-256: d5cee35a53212f7f09abe4b8095e5ef55cda3678eec209543f12a96509d1118b
font_01_sfnt_off0000f1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DE 10420 bytes
SHA-256: 6b23bb71581a3fdb1434b9f89ad6ddbe15cf1199b2860df2a4e1a8a616399c10

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