Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bfdccb180688278…

MALICIOUS

PDF

99.5 KB Created: 2021-06-03 04:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: d29ad058cbb6d89eb47788bd9f39c2fb SHA-1: 40c32b7ed38b49f7caec7c6d079db1970c221f74 SHA-256: 0bfdccb180688278b9a441673bf582de9ffcea3a5d04da29857499ca06494d28
186 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 pointing to disposable domains, indicative of a link farm or SEO manipulation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://krisoc.ru/pbw?utm_term=quatrefoil+en+espa%25C3%25B1ol+figura+geometrica PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4500670/normal_5fe1351266376.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423442/normal_60159b23db969.pdfIn PDF document text
    • https://juwarojolajekol.weebly.com/uploads/1/3/4/1/134108785/gigolav.pdfIn PDF document text
    • https://ridejotewofo.weebly.com/uploads/1/3/5/3/135314456/vozenina-suzeji-pinisepi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382412/normal_5fff15b0c99fb.pdfIn PDF document text
    • https://gakififevorejep.weebly.com/uploads/1/3/1/8/131872199/eeda10497ca7d77.pdfIn PDF document text
    • https://vumopiwerelo.weebly.com/uploads/1/3/4/7/134730258/bavuwebefujelizukit.pdfIn PDF document text
    • https://gulukuse.weebly.com/uploads/1/3/2/7/132740430/4443160.pdfIn PDF document text
    • https://buwenesuxunuga.weebly.com/uploads/1/3/4/8/134883777/8f2e3d73004b503.pdfIn PDF document text
    • https://niburisugop.weebly.com/uploads/1/3/6/0/136082965/tuzulupisutelo.pdfIn PDF document text
    • https://purolitawi.weebly.com/uploads/1/3/4/8/134894903/zipubumenupigolegito.pdfIn PDF document text
    • https://tekujutiwud.weebly.com/uploads/1/3/4/2/134234893/f3ded5.pdfIn PDF document text
    • https://vugilove.weebly.com/uploads/1/3/4/2/134234765/fujebureku.pdfIn PDF document text
    • https://duveniwapawas.weebly.com/uploads/1/3/4/2/134265961/zubezorolijilej-poruwov-soxexozo-voxovinipow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://gatasulupu.pbworks.com/f/rajuxovogutaziti.pdfIn PDF document text
    • http://gozuwef.pbworks.com/w/file/fetch/144502542/tixixelodumuralogegis.pdfIn PDF document text
    • http://fulusivijomu.pbworks.com/f/volulevoponovasanonazo.pdfIn PDF document text
    • http://giwupiraride.pbworks.com/w/file/fetch/144445479/widozizajikexunorenibel.pdfIn PDF document text
    • http://veweran.pbworks.com/f/37225077671.pdfIn PDF document text
    • http://pebokuvog.pbworks.com/w/file/fetch/144529185/69826047272.pdfIn PDF document text
    • http://jujirafamena.pbworks.com/f/universe_sandbox_2_download_apk_dropapk.pdfIn PDF document text
    • http://xutosop.pbworks.com/w/file/fetch/144462327/the_new_oxford_annotated_bible_with_apocrypha_new_revised.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001371e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1371E 5488 bytes
SHA-256: 2f95fc9e1a5bd4177835c90e362c5a0a33bbcc2f931a4d7543a06a86d5afcf14
font_01_sfnt_off0001496b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1496B 12048 bytes
SHA-256: aed251580bba111934e62452ec9fe67db0872fb5e93d08b7452b415bf88d1ce9
font_02_sfnt_off0001705f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1705F 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176