Malicious PDF — malware analysis report

Static analysis result for SHA-256 959c8380601b8981…

MALICIOUS

PDF

74.4 KB Created: 2021-03-25 16:34:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9a8c102bf8490a58c03db9319a588c00 SHA-1: 5ba35ca3fef2bbc16cc89ac8c59ebf6223f040d2 SHA-256: 959c8380601b898178204fd46186f662614ec614510e965da27a272b92bb4013
226 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a LOLBin command-execution lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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/award?keyword=3rd+conditional+sentences+pdf PDF link annotation
    • https://fajuvupo.weebly.com/uploads/1/3/5/3/135310445/fe2c419005ce.pdfIn PDF document text
    • http://gnoogle.site/psychology_books_for_sale_collegeg69u4.pdfIn PDF document text
    • https://bosubunu.weebly.com/uploads/1/3/4/6/134693877/xumesomawametinugu.pdfIn PDF document text
    • http://businessmentality.com/dazivurawilomeneturi61s4a.pdfIn PDF document text
    • http://hookup153.site/gewaje3cqmp.pdfIn PDF document text
    • https://pobivizitonep.weebly.com/uploads/1/3/2/8/132815986/xituwekezuf.pdfIn PDF document text
    • http://ericksandoval.com/guia_aprender_frances9isi3.pdfIn PDF document text
    • https://pabimoju.weebly.com/uploads/1/3/3/9/133997489/0822d99.pdfIn PDF document text
    • https://xipasole.weebly.com/uploads/1/3/4/8/134853136/461217.pdfIn PDF document text
    • https://xatodibe.weebly.com/uploads/1/3/5/9/135966399/4993740.pdfIn PDF document text
    • http://lnstagramsecurity.net/sobobifiik2gq.pdfIn PDF document text
    • http://lightly.store/black_baby_boy_hairstyles_for_curly_haird45o1.pdfIn PDF document text
    • https://mugejonisisekof.weebly.com/uploads/1/3/1/4/131437633/magegiloxati.pdfIn PDF document text
    • http://serviceforyou.site/game_of_thrones_books_vs_show_which_is_better_redditv9yil.pdfIn macro / runtime command snippet
    • http://spencermcman.us/26002933919c6jfg.pdfIn PDF document text
    • https://wopufibirebosaw.weebly.com/uploads/1/3/4/4/134466277/e49eca236b.pdfIn PDF document text
    • http://semengergel.ru/pete_the_cat_halloween_read_aloud_youtube5wwcj.pdfIn PDF document text
    • https://mugejonisisekof.weebly.com/uploaIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jevopemosod/wuxam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f65732a-1a9e-4e8c-a77b-6dcd7f5b607b/my_side_of_the_mountain_movies.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/garmin_etrex_30x_gps_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/048e4b09-c263-4aed-8668-8574c18227ea/51445102524.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_off0000e5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C1 5220 bytes
SHA-256: a4f007cb23b0d331a7302e190287a8b26691c78a70366620be023940954793a1
font_01_sfnt_off0000f789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF789 10852 bytes
SHA-256: 6a458696e1b2786dd9ce2bb52355d198c24af53c120a0cd0c7c5b19f7f0d9331