Malicious PDF — malware analysis report

Static analysis result for SHA-256 961f02877f11e693…

MALICIOUS

PDF

84.0 KB Created: 2021-02-12 18:20:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 15c339d70de9ddb4f3aeae0156e3e23f SHA-1: cb64e5dfd043f37243c277c3d0a2cf10f2f455b0 SHA-256: 961f02877f11e693a62b8f469a24fcc29b5edf29b624157ece4a8aff282ba360
184 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to known malicious redirector infrastructure, specifically 'https://yafferge.ru/wix?keyword=no+answer+in+german'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and appears to be non-readable content, suggesting it's not intended for user consumption but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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/wix?keyword=no+answer+in+german In PDF document text
    • https://cdn-cms.f-static.net/uploads/4475217/normal_601e3ee5c71f8.pdfIn PDF document text
    • https://cdn.sqhk.co/fegozanodedu/jfGZhjc/background_hd_wallpapers.pdfIn PDF document text
    • https://cdn.sqhk.co/saboxiwago/vtjjhbn/sojipimamiden.pdfIn PDF document text
    • http://uniques.space/broccoli_sprouts_nutritional_informationces55.pdfIn PDF document text
    • https://cdn.sqhk.co/retesixabe/48B2ijC/fast_notepad_v1._3._0_android_app.pdfIn PDF document text
    • http://posuvukapimufes.iblogger.org/all_bollywood_movies_mp4_hd.pdfIn PDF document text
    • https://koxizekeb.weebly.com/uploads/1/3/4/7/134770308/29c5f5fa922.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494674/normal_600bc7fc60bdd.pdfIn PDF document text
    • https://legutuxubumid.weebly.com/uploads/1/3/1/8/131872058/ruwunobepudef-kowuxumukuvalex-mipevu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488569/normal_6023dc6896572.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372723/normal_6008f105a5d12.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/gapuruxumeg/best_romantic_movies_2018.pdfIn PDF document text
    • http://tamazodatitemi.epizy.com/camscanner_unlocked_apk_free.pdfIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/kotor_2_companion_level_up_guide.pdfIn PDF document text
    • http://varoniwarovez.rf.gd/dajiwaluzinuverebujax.pdfIn PDF document text
    • http://poluwusafoge.epizy.com/wazavexivep.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/computer_terms_full_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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE176 7884 bytes
SHA-256: 8a6c32c0ffc24a522fe9411a012b705bbf62fdc66a1e1f26e6d4623e2055eb77
font_01_sfnt_off0000fc0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0E 5036 bytes
SHA-256: ec572209a0f30dfe624910ef58fec6118136000fe8281d094ee44fd5ccc45d1c
font_02_sfnt_off00010d24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D24 6672 bytes
SHA-256: 915ac967cb8870392f18fa3c39562aab4cb0ab9b413aacb1a110e6bbed990e5e
font_03_sfnt_off00011f0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0D 10436 bytes
SHA-256: 423bbfe24583e177352a409031411e2892ffd85eef4249519b7786367ef35092

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