Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1adb34d68e6ac65…

MALICIOUS

PDF

67.6 KB Created: 2021-01-25 21:28:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 844a926be6ef4ca63c99879f04b14274 SHA-1: 2711adaa1db035fab05b6c9979aa30e24f47fefa SHA-256: c1adb34d68e6ac65a29ee2b84fc9b53d6be1a295b68335206a0baed2e29404a9
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous embedded links, many of which are identified as part of a link farm on disposable hosting, with a critical heuristic firing for a malicious redirector. The primary malicious URL identified is https://yafferge.ru/aws?utm_term=oregano+planting+guide, which is used to redirect users to potentially harmful sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/aws?utm_term=oregano+planting+guide In PDF document text
    • http://dfahsdfgjsfg.online/moto_bike_attack_race_apk6i5ox.pdfIn PDF document text
    • http://fruit-ital.space/instagram_login_error_no_user_foundgpx04.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424029/normal_5fdf72e2c1529.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369332/normal_5fd7f427d5a7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382617/normal_5fd838bad080b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491159/normal_5ffd72e8db741.pdfIn PDF document text
    • https://cdn.sqhk.co/zidulibu/5gfihha/75404948333.pdfIn PDF document text
    • http://demask.space/management_des_entreprises_coursoi42t.pdfIn PDF document text
    • http://creditpm.com/starmaker-_sing_karaoke_songs_for_pc1ol1f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406454/normal_5ff7a172c2989.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475562/normal_6003f83e827ea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481667/normal_5fd0864d504d5.pdfIn PDF document text
    • http://rm-swis-mine.com/printable_2nd_grade_math_placement_testdxnyl.pdfIn PDF document text
    • http://komarovskii.xyz/ouroboros_fma_significadozccfv.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/fixararololu/merlins_magic_chakra_meditation_music.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/pisirilow.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/guided_bear_hunts_in_wisconsin.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_off0000ce05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE05 4976 bytes
SHA-256: 68c4925d9b62fbb39bac8160ce07244ad3e70bd96ba18d482a33807a01ada72b
font_01_sfnt_off0000defa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFA 10096 bytes
SHA-256: 959cd1f6c9c522f484733077fdbdbf14b0b0d1fe807cc7efad575dcf0b82aacd

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