Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ac2c209d4f90c64…

MALICIOUS

PDF

82.2 KB Created: 2021-05-05 12:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fd7a1c6f2bb24c31f27f4d92ac727e6 SHA-1: 2409a194c14ce953cf18329e080e2e9a8ac0e36f SHA-256: 7ac2c209d4f90c6435c7c335e7ac9fee283c90edaaa1c7685f80432bd839d0d6
196 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating it is a phishing attempt and a social engineering attack (ClickFix). It embeds external URIs, with the primary malicious URL being https://xezojetit.ru/strik. The document body, though heavily obfuscated, contains text related to 'Wd my cloud os 5 windows 10 credentials', suggesting a lure for credential harvesting. No scripts were extracted, but the PDF structure and embedded links point towards a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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/strik?utm_term=wd+my+cloud+os+5+windows+10+credentials
    • https://cdn.sqhk.co/zokuwagopole/3VNazeP/pegazubuganejipazuloviga.pdf
    • http://fragcups.com/grolier_international_americana_encyclopediazcds2.pdf
    • https://static.s123-cdn-static.com/uploads/4420449/normal_5fe4a9c95ea1b.pdf
    • http://wejnpowk.space/the_war_of_art_steven_pressfield_goodreads201kf.pdf
    • http://alex-chekalev.com/el_poder_del_ayuno_y_la_oracion_sermonsvme3.pdf
    • https://static.s123-cdn-static.com/uploads/4452839/normal_5fe0ff01d51bc.pdf
    • https://cdn-cms.f-static.net/uploads/4405419/normal_60692ffeb99a5.pdf
    • http://about-central.com/tuvovofusigulolomegg9uf.pdf
    • https://cdn.sqhk.co/zinumazak/l2chaPz/gogudowekefebofaleseb.pdf
    • https://koludoselutak.weebly.com/uploads/1/3/4/8/134893798/xavemexixevume_kadepawixupol.pdf
    • https://cdn.sqhk.co/dakagugi/kCihJii/jekuf.pdf
    • https://nelunozulugekis.weebly.com/uploads/1/3/0/7/130739970/25aaa76f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://f43304fd-85e4-489a-8612-81977e01be4a.filesusr.com/ugd/b6f504_c43501a8e1cf41acb72ca7f28b01e95d.pdf?index=true
    • https://f200304d-316b-45a9-b05c-680123ec6d1a.filesusr.com/ugd/aad1a2_4051c0b9c05145cb91f4801ecee84f35.pdf?index=true
    • https://bb74f61c-7045-47bf-9a7e-968101ee373e.filesusr.com/ugd/81ef4b_9ef16d6b3ab949bead9284d11b62fc99.pdf?index=true
    • https://320f262d-053d-461a-9009-498fa3b044f5.filesusr.com/ugd/8e680a_9e3e28cf0d094a10849eaf6f388bfb26.pdf?index=true
    • https://33da92c3-26de-4f6b-bf12-1693cb6a6e79.filesusr.com/ugd/0307f2_b0a34eb41b2f42b48b36e5f89eca3aea.pdf?index=true
    • https://7f03322d-63d6-449b-a8c2-a80beffeb2b6.filesusr.com/ugd/2994dd_d34bd7c98d854502aceb06b78264c667.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5c0.bin
6cd1d7de03b1ad3a17adeb9dab1ae3e6db6a94f9922d7177657fe6d34a6f4627		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C0 5492 bytes
font_01_sfnt_off00010873.bin
bd9f0ff4104594b6e1e48261a0574b62bc5d630398ae835d6eb063df60bfec19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10873 10760 bytes
font_02_sfnt_off00012d84.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D84 4324 bytes

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