Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f36b15b1c96a321…

MALICIOUS

PDF

81.6 KB Created: 2021-03-10 11:05:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 760334787d5d1544abf43aadb06f577e SHA-1: 1dbee2d1feca64d82b3c5d10e7fca6f4bdb8cae5 SHA-256: 6f36b15b1c96a3212d0f5d6985a8baa25ab17ed3a2c10d995ac471d499d67258
194 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the presence of numerous external URLs and the 'SE_DOWNLOAD_BUTTON' heuristic point to a user-driven lure to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://druttle.ru/award?keyword=biometric+screening+form+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375355/normal_601127b4ba813.pdfIn PDF document text
    • https://vominitaxa.weebly.com/uploads/1/3/4/6/134677623/pinuzaku-zolasuwar.pdfIn PDF document text
    • https://gabodubelekopo.weebly.com/uploads/1/3/4/3/134356924/savejaraju_povewutoxuve.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413236/normal_603bb54917ba9.pdfIn PDF document text
    • https://deriwofapavuz.weebly.com/uploads/1/3/4/3/134311795/4166485.pdfIn PDF document text
    • https://dubiriji.weebly.com/uploads/1/3/1/4/131406762/7647256.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408718/normal_5fefcb2bd5cfd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382962/normal_60475bc2b5170.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/12ff48a3-a631-4752-9b4e-5b3b9bd799d1/51195563189.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/circles_post_malone_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/30461625439.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c365da2-6ddf-44da-92f4-51caea7f759a/45385873942.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbf2957d-20a5-4658-9095-0000def19681/77049798810.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf7f7938-7630-45ab-bcd2-0ddbe28b35da/jatolol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e849452f-7917-4c37-9617-1b48e4f41518/heart_of_darkness_sparknotes_chapter_2.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/video_bts_mma_2018_full_performance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74b6fc10-ba43-409d-bc67-abecca184b2d/makuvodusozabu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00528747-2faf-4b1b-a87f-cf667d1cb6cc/zaturutatumaxewopuxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b15c6bf-83a3-448c-b4fe-eb825d30dfdd/52834474263.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC1 5284 bytes
SHA-256: 3e01dd726e855012bf9bd2e125742873f1b896a6d604ea26c59f5f3044db668c
font_01_sfnt_off000100ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AC 10292 bytes
SHA-256: 5057fe567c0deaa91503f74f0f8f1d6528deb8f83c3aded610a6ba9f757057c6
font_02_sfnt_off000123e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E3 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67