Malicious PDF — malware analysis report

Static analysis result for SHA-256 8128ecf74790faa8…

MALICIOUS

PDF

76.4 KB Created: 2021-04-24 01:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: ca60de3f3e5178be07d8e03715c698b2 SHA-1: f8b6d63e886e34055c67a4499066eee791a57692 SHA-256: 8128ecf74790faa863a6b2eba91057c8f66c25428fe7fe51dba57c94c544f060
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 hosted on disposable domains, indicating a link farm or SEO spamming operation. One of the primary URLs, https://zajinet.ru/strik?utm_term=install+graphlab+python+3.6, suggests a potential lure for users searching for software installation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=install+graphlab+python+3.6 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365642/normal_5fd0e06ac5608.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451544/normal_6008c189277d8.pdfIn PDF document text
    • http://xatovapotogu.mywebcommunity.org/cuales_son_los_sintomas_cuando_se_le_baja_el_azucar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475571/normal_601baa444af0e.pdfIn PDF document text
    • http://worabipupe.mypressonline.com/50396031970.pdfIn PDF document text
    • http://garobunatuxovi.scienceontheweb.net/clipsal_2020_series_switch.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475727/normal_60515788d082a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443354/normal_60316d4db6cc9.pdfIn PDF document text
    • https://cdn.sqhk.co/jagapifa/VWAjfhd/love_rosie_trailer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446647/normal_60390c069df6f.pdfIn PDF document text
    • https://cdn.sqhk.co/dabozijide/if2ijjc/american_drag_racing_game.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gonesolipekivin.rf.gd/88194907433.pdfIn PDF document text
    • http://videwebik.epizy.com/zegepek.pdfIn PDF document text
    • https://f187853a-68e6-4ed6-a420-9593b89d6738.filesusr.com/ugd/27c34a_7eb49a9df3a44a439f17b5bdc48fa078.pdf?index=trueIn PDF document text
    • https://dba0ca6b-c979-46b3-87c9-041648dee063.filesusr.com/ugd/6f58fb_6ccd1041c2b844aaa20efcbc0fcb7269.pdf?index=trueIn PDF document text
    • https://3dbd840c-7861-42b4-b064-af52d1d2f4eb.filesusr.com/ugd/86319b_8d87773b06874f5ba6cf105d854cea08.pdf?index=trueIn 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_off0000edc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC2 5612 bytes
SHA-256: 0d884e7e5d7f0cb16df78b913b32920007e1dd2b3f84aae7251149522192a381
font_01_sfnt_off000100d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D7 10456 bytes
SHA-256: fc82efdee494f03831b407426f43e5c37e566acfa061d4c96973c7c9f6df0f89

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