Malicious PDF — malware analysis report

Static analysis result for SHA-256 77c15feda2abe6eb…

MALICIOUS

PDF

72.0 KB Created: 2021-02-11 21:26:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 44cf1b4b4b5b5778809ee917e44e0a6b SHA-1: 40c432a00d8dc8a02948d95b0c5ea5fbc5a15b39 SHA-256: 77c15feda2abe6ebb538b948c2427e8483365ec2613ced15692463d9536367d8
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. The embedded URLs, such as 'https://bologen.ru/wix?keyword=suzuki+cavalcade+bobber', likely serve as lures to malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/wix?keyword=suzuki+cavalcade+bobber PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4459175/normal_5fecebe402b1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413851/normal_5fd1e9037a6b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410217/normal_601980346cbe1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414849/normal_5fd2e74730506.pdfIn PDF document text
    • http://fesebenawasoz.iblogger.org/bidmas_differentiated_worksheet_tes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383300/normal_5fd64dad127fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488574/normal_60249664ba5a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489257/normal_5fdbcbea9454f.pdfIn PDF document text
    • http://gojepifega.22web.org/contemplate_out_in_a_sentence.pdfIn PDF document text
    • http://vixurefivero.66ghz.com/tungsten_bold_font_free_ttf.pdfIn PDF document text
    • https://xajomorunineg.weebly.com/uploads/1/3/1/3/131383441/xudutepolaxeva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480187/normal_60256083eee92.pdfIn PDF document text
    • https://bemuzulezevateb.weebly.com/uploads/1/3/4/4/134440878/6f09716b45a70.pdfIn PDF document text
    • https://nezuzubes.weebly.com/uploads/1/3/5/3/135327702/vetatudelovugameki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pusixa/becky_g_all_songs.pdfIn PDF document text
    • http://mudozegiviw.epizy.com/ilmi_gk_capsule.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/lokubufonaw.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_off0000ddda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDA 5172 bytes
SHA-256: 5e9cdae4fce9a0cb9e0df0f588efec136e84a110334f2ba13aeb722cdc21f996
font_01_sfnt_off0000ef8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8E 10476 bytes
SHA-256: 50094c01f31947b272648840c922d6764f1800b339453614e37360cda507af9b

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