Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bc05b8ab1e20388…

MALICIOUS

PDF

72.2 KB Created: 2021-06-14 02:35:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6125cdc88dd2168f2cdb569b47deff62 SHA-1: 0a69da97930401bd371038ceb93a57f976dfe238 SHA-256: 7bc05b8ab1e2038850e6cc404ffa16fe50c6066dd20d21976de2939d9add6dbd
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 pointing to disposable hosting services like Weebly, suggesting a link farm designed to distribute malicious content or facilitate phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://synerhu.ru/pbw?utm_term=pulse+and+digital+circuits+by+anand+kumar+pdf+free+download PDF link annotation
    • https://dinidoleto.weebly.com/uploads/1/3/0/9/130969871/b813c59afa3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380382/normal_606428827ad87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454808/normal_603528aac03b3.pdfIn PDF document text
    • https://puwikopigab.weebly.com/uploads/1/3/1/1/131163601/kevesezisabogepitoxe.pdfIn PDF document text
    • https://vapurexox.weebly.com/uploads/1/3/4/8/134865026/xunus-pewefirej-zosodobunewobef.pdfIn PDF document text
    • https://degexaxi.weebly.com/uploads/1/3/1/4/131406510/sifibenopolegomez.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370062/normal_5fedb4caccceb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417046/normal_600200032e984.pdfIn PDF document text
    • https://xepinepuro.weebly.com/uploads/1/3/0/9/130969238/rowabinitupota.pdfIn PDF document text
    • https://maraliva.weebly.com/uploads/1/3/2/7/132712127/bodosujiwisonuw_kizuretet_dokajupozawolet_benojinezojuro.pdfIn PDF document text
    • https://velazidolis.weebly.com/uploads/1/3/0/9/130969689/4b7b91d6a9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495685/normal_5ff27543941ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465390/normal_602ed4c885a47.pdfIn PDF document text
    • https://piwixejiwos.weebly.com/uploads/1/3/2/8/132815196/8a7a6f56a9da91e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458635/normal_603866982193a.pdfIn PDF document text
    • https://noloxuxema.weebly.com/uploads/1/3/1/4/131453633/kefinopemi.pdfIn PDF document text
    • https://puwevifu.weebly.com/uploads/1/3/4/4/134465284/fimavunixodesobo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414360/normal_60bc445599b77.pdfIn PDF document text
    • https://mufuxavezefajox.weebly.com/uploads/1/3/4/4/134497947/3828981.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mujiwareneje.pbworks.com/f/space_shooter_mod_apk_download_for_android.pdfIn PDF document text
    • http://kepojijudiva.pbworks.com/w/file/fetch/144508170/ssc_cgl_gk_capsule_2020_in_hindi.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_off0000da18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA18 5876 bytes
SHA-256: 349334c24c97aafe99f5c1ad28565e3e4c22fd68418d622f90e97a9f6802cca2
font_01_sfnt_off0000ee20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE20 10712 bytes
SHA-256: 4b580ef4f749bfa28c2470b9468fa6e2880376be5a71060e060c151ebaaf0b7f