Malicious PDF — malware analysis report

Static analysis result for SHA-256 071fcff1b664601d…

MALICIOUS

PDF

100.8 KB Created: 2021-03-22 23:29:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 189737cb777df9de0d2b01d8988dd2fc SHA-1: e1ddae9f61de3208d310eb225b300aea3f2b9e3f SHA-256: 071fcff1b664601d4bd8ac07f27239bd98d7f624fa8d45efcd539a55dc3f6f1d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, characteristic of a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to redirect users, potentially leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://cdn.sqhk.co/karopepagu/Sve5Mhh/continental_race_king_2._2_protection_26_faltreifen.pdf In PDF document text
    • http://tejidirexe.mywebcommunity.org/dikuxafigogejinu.pdfIn PDF document text
    • https://cdn.sqhk.co/tosilura/7giZ95u/nhl_schedule_2020_playoffs.pdfIn PDF document text
    • http://mizizufiku.mywebcommunity.org/620166548.pdfIn PDF document text
    • https://cdn.sqhk.co/tivanosox/gFghicr/bowuzepixedivif.pdfIn PDF document text
    • https://xetutinafo.weebly.com/uploads/1/3/0/7/130775845/8976174.pdfIn PDF document text
    • https://cdn.sqhk.co/wanuvudeb/jeijgfO/xodezowuzewaxetajorasif.pdfIn PDF document text
    • http://powuvomewekuxeb.getenjoyment.net/apiculture_book.pdfIn PDF document text
    • https://xivunububan.weebly.com/uploads/1/3/0/9/130969166/vufubodusezi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/dRGGkpkNhSI/wb?keyword=introduction%20to%20data%20science%20in%20python%20assignment%201%20answersPDF link annotation
    • https://uploads.strikinglycdn.com/files/3d3cf66d-342a-49e8-bb95-bfbdf1b48023/funk_drum_patterns_midi.pdfIn PDF document text
    • http://lufiwivumijej.myartsonline.com/50_literary_devices.pdfIn PDF document text
    • http://pekafujojef.onlinewebshop.net/besuzoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d9d2839-6214-4dc5-9c41-a8a64ff5dd12/17214790764.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/46889571717.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06865924-438a-4813-b5b7-2ce50c2fa513/weber_genesis_e-330_burner_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15fa75b7-93a9-4bc5-aa12-4b867ba38aa7/10015402555.pdfIn PDF document text
    • https://s3.amazonaws.com/taturi/xopisupa.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/82616832170.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/video_er_professional_for_edge.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF471 19644 bytes
SHA-256: 8b68580a1a39b5923dcfd427253b792c01f4c6bb5ee14efbb4970e9362ed6881
font_01_sfnt_off00013295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13295 5640 bytes
SHA-256: a1b8edf972053edb70522a8454c4f2accf5e3d33840aab9d6c3525680db4e4a9
font_02_sfnt_off000145b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145B0 12068 bytes
SHA-256: f444ec25479b4c62d1deb6802dc1f1ec7619987927ca3f673a03da33670bd297
font_03_sfnt_off00016f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F0F 16340 bytes
SHA-256: 0ce760d261d0c01a2a1b1da6f3013d04c5d8fef4ca267e59a8b7ae36c5551e3b