Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccb165cd73bf448d…

MALICIOUS

PDF

85.2 KB Created: 2021-06-01 18:27:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 2f5aac625000157a034d707b67ded293 SHA-1: 4b39f687c7525158d05a33d332bae478e83febe1 SHA-256: ccb165cd73bf448d51f51b0dd57b9fe04e6c209c51e523c59ed4beb1f6393757
126 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, suggesting a link farm or SEO spam operation. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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://xezojetit.ru/123?utm_term=captain+tsubasa+dream+team+guide+reroll PDF link annotation
    • https://dafemiperufukoz.weebly.com/uploads/1/3/1/3/131379503/penuzuxoroboru_teferikaxa_faluwated.pdfIn PDF document text
    • https://pilumana.weebly.com/uploads/1/3/2/6/132683063/2350199.pdfIn PDF document text
    • https://kasapumaf.weebly.com/uploads/1/3/1/3/131397987/bobigunakuxagare.pdfIn PDF document text
    • https://rulewosiziruzo.weebly.com/uploads/1/3/0/7/130739522/rukosubatajanapope.pdfIn PDF document text
    • https://gatilavim.weebly.com/uploads/1/3/4/3/134391542/vixedezalore.pdfIn PDF document text
    • https://delovamubikener.weebly.com/uploads/1/3/4/7/134707073/5247163.pdfIn PDF document text
    • https://ninozaji.weebly.com/uploads/1/3/4/6/134690112/6664793.pdfIn PDF document text
    • https://nofakefol.weebly.com/uploads/1/3/4/3/134341926/002b85.pdfIn PDF document text
    • https://pukakanasosakum.weebly.com/uploads/1/3/5/3/135392678/5667696.pdfIn PDF document text
    • https://bosebozix.weebly.com/uploads/1/3/4/6/134601905/ketirosijuk.pdfIn PDF document text
    • https://sufosuzupunu.weebly.com/uploads/1/3/1/3/131379650/zekejobutupusip.pdfIn PDF document text
    • https://nuzikufu.weebly.com/uploads/1/3/4/7/134766145/vilinirizugiwivi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pamotekegopa.pbworks.com/w/file/fetch/144465576/batch_convert_jpg_to_online.pdfIn PDF document text
    • http://kinuwibe.pbworks.com/w/file/fetch/144470781/pegitobikovugodurex.pdfIn PDF document text
    • http://garifukedako.pbworks.com/f/how_to_get_android_imei_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4e2fc1b-ccd6-4cf5-a266-0f08e9c9d13d/3194363550.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76cf328a-bfe6-4fa7-b5eb-fb33546fa2b1/reset_panasonic_viera_tv_remote_control.pdfIn PDF document text
    • http://gazumadu.pbworks.com/f/72937856302.pdfIn PDF document text
    • http://kufujibumufa.pbworks.com/f/vogelhaus_blockhaus_bauanleitung_kostenlos.pdfIn PDF document text
    • http://ganosidil.pbworks.com/w/file/fetch/144453198/79030697670.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d7478d4-2b67-4248-a3f6-4a75de9ab1b2/51712104035.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_off0000ebc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC9 7384 bytes
SHA-256: 27f0549d96e0e32efeb31f58d10515cf36806420004926c0c21c54cc3b5b6c2b
font_01_sfnt_off000104b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B0 5324 bytes
SHA-256: dfa53a6aebc1ff3c5e90c1e9f077cfbfe314c10fa8078c9e29b20545d08e3acc
font_02_sfnt_off000116a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A7 14832 bytes
SHA-256: 9b24d640e9fa00f8c578995c9c0624ce468702d632a16856024840503ce56a14