Malicious PDF — malware analysis report

Static analysis result for SHA-256 41856e4829b79557…

MALICIOUS

PDF

74.3 KB Created: 2021-04-06 07:31:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 87a366bbe21bb05804b3330840afd3a2 SHA-1: d3c68b58731459d6b9d4adb51475013da4b086cb SHA-256: 41856e4829b7955741b44363958474c7cc610b682049c9f2d0df9b89120b4ef4
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are associated with link farm heuristics, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the presence of multiple suspicious URLs and the document's deceptive nature point towards a phishing attack.

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://resalured.ru/123?utm_term=cisco+2960+48+port+data+sheet PDF link annotation
    • http://vvvvvvvvvvvvvvvvvvvvvb.xyz/does_costco_sell_popcornersm5esp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454172/normal_5fe06b7216a2f.pdfIn PDF document text
    • http://com-signto5.xyz/53062843876ffobm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383445/normal_603fd66692ca5.pdfIn PDF document text
    • http://gagarinski.su/zoom_g1xon_price_in_pakistanc4nkm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446636/normal_6026a1b0451c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416787/normal_601db499bd161.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454041/normal_5ffb5c766ea06.pdfIn PDF document text
    • http://salearea.pro/zotovigabanifikoninofinegk6n1i.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426813/normal_600582300db8c.pdfIn PDF document text
    • http://tofezomuvebaf.iblogger.org/marriage_certificate_online_form.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483071/normal_6057b0a245f4b.pdfIn PDF document text
    • http://austritkfa.com/14578018291wc8pa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407301/normal_5fc68e2cb0fc9.pdfIn PDF document text
    • http://organize.shop/nilonejijab2xsk.pdfIn PDF document text
    • http://help-nanny.site/lr_eswari_amman_songs_free_tamiltunesoehv6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pugusazamek.epizy.com/56702894049.pdfIn PDF document text
    • https://www.flickr.com/photos/webernetz/37176457944In 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_off0000e135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE135 5900 bytes
SHA-256: acb41e48d1b7a77b53410fbd370a7ab91de462b9f82909db30e3bd318b121567
font_01_sfnt_off0000f544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF544 11656 bytes
SHA-256: 42cf1e3e68864100a567d2214dbf74c2791697f4ff9e19487337f1442f5fdc54

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