Malicious PDF — malware analysis report

Static analysis result for SHA-256 2826de303a3f68aa…

MALICIOUS

PDF

78.1 KB Created: 2021-02-13 13:40:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 133d20f77637416527306d76540fdf36 SHA-1: 97b171a493c1110df85c9b9800d88becdfda06e9 SHA-256: 2826de303a3f68aa5cef560fe53d8c7637c4554f1161e8cabd378f09d41b7a03
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection mechanism to host malicious content. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a game guide, indicating a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://maypoin.ru/wix?keyword=railroad+tycoon+2+platinum+guide PDF link annotation
    • http://korsabarca.com/1801146371a0d5.pdfIn PDF document text
    • https://fofirajajamide.weebly.com/uploads/1/3/4/6/134643930/8358253.pdfIn PDF document text
    • https://wakukaxowemaba.weebly.com/uploads/1/3/5/3/135303752/8793666.pdfIn PDF document text
    • http://teniran.22web.org/xiaomi_mi_9_se_android_one.pdfIn PDF document text
    • https://furedanoduribi.weebly.com/uploads/1/3/4/6/134681858/xapinasefanu.pdfIn PDF document text
    • https://tujeliwavujojow.weebly.com/uploads/1/3/5/3/135304707/f924bc22.pdfIn PDF document text
    • https://pefodiral.weebly.com/uploads/1/3/4/4/134476409/giwutozerozurufuza.pdfIn PDF document text
    • http://bobatukuxoto.iblogger.org/73560106307.pdfIn PDF document text
    • http://poxinezov.iblogger.org/40795377841.pdfIn PDF document text
    • https://badupulok.weebly.com/uploads/1/3/4/8/134855905/wolipafuxiv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://podaviloridi.rf.gd/textview_animation_android_github.pdfIn PDF document text
    • http://firabano.epizy.com/isometric_grid_paper_template.pdfIn PDF document text
    • http://susesibukof.epizy.com/vojokin.pdfIn PDF document text
    • http://zelavejifokekoj.epizy.com/double_arm_needle_guide.pdfIn PDF document text
    • http://fupisetugib.rf.gd/72035250366.pdfIn PDF document text
    • http://mafofeguf.epizy.com/chernobyl_series_dublado_utorrent.pdfIn PDF document text
    • http://gimusatis.rf.gd/zapizigovurikubupaluwi.pdfIn PDF document text
    • http://sajipesexadagon.epizy.com/fence_encroachment_agreement_sample_form.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_off0000f56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56C 5456 bytes
SHA-256: bdeeeca0b760aa844c1696c0263b2e00d30b2e8732ae7dbe2016dda112fa0adf
font_01_sfnt_off000107f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F4 10388 bytes
SHA-256: a67ecad85cfc2b092f0dd2143647f3a94509f77fd6be445cc277c2c2a9d0d01c

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