Malicious PDF — malware analysis report

Static analysis result for SHA-256 808c26ba7af2877c…

MALICIOUS

PDF

70.7 KB Created: 2021-03-12 14:14:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 6abc472bf62a4cb251ec613980bffc89 SHA-1: 2d919988e798750013dd32c0afcd9b1e3f573360 SHA-256: 808c26ba7af2877ca2c5436bf895193d5ec0fe0b34b463e4d34aa0610e13021b
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ClamAV as Pdf.Phishing.Trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to distribute content via numerous small, potentially malicious, links. The ML classifier also strongly suggests maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/award?keyword=list+of+synonyms+and+antonyms+pdf+for+ielts PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4473375/normal_603e3d092ad7e.pdfIn PDF document text
    • http://rixorevu.getenjoyment.net/86971684430.pdfIn PDF document text
    • https://cdn.sqhk.co/kibutonap/iiifhhy/port_lympne_zoo_tickets.pdfIn PDF document text
    • http://kedejivebirago.iblogger.org/12096452814.pdfIn PDF document text
    • http://mevukavotidu.getenjoyment.net/zidiwamifitu.pdfIn PDF document text
    • http://fepotarugagi.22web.org/1848471424.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476939/normal_6027b7f76de32.pdfIn PDF document text
    • https://gorejirulikem.weebly.com/uploads/1/3/4/7/134738880/4397268.pdfIn PDF document text
    • https://cdn.sqhk.co/vitimosugu/fjfMcjh/craigslist_furniture_for_sale_springfield_il.pdfIn PDF document text
    • https://fozibopabedabe.weebly.com/uploads/1/3/6/0/136082219/45f12394495722.pdfIn PDF document text
    • https://dumidonawusirug.weebly.com/uploads/1/3/5/3/135306770/128718.pdfIn PDF document text
    • https://sulewana.weebly.com/uploads/1/3/4/6/134605909/1953073.pdfIn PDF document text
    • https://posapana.weebly.com/uploads/1/3/1/4/131454172/viwoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475995/normal_5fdad0460d73e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472479/normal_5fe67a5485d93.pdfIn PDF document text
    • http://kigirifaduguv.getenjoyment.net/harbor_freight_13_drill_press_review.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://donenufalu.rf.gd/90217719435.pdfIn PDF document text
    • http://juludiripo.myartsonline.com/newenufob.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_off0000da8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8A 5228 bytes
SHA-256: 2cb17bfd12fcce395b1f9e9dbefa14d8ef1ded58c2e226f6180c04e2e008dbac
font_01_sfnt_off0000ec48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC48 9988 bytes
SHA-256: 2ec0dbb7c644589d88067f92472a319fcee499b3a633be76a6646848c587f263

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