Malicious PDF — malware analysis report

Static analysis result for SHA-256 a74d7f05567e83fe…

MALICIOUS

PDF

96.7 KB Created: 2021-02-02 10:44:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 854dee1ded1542afd819d650ad0f6d79 SHA-1: 35ab8eb058b2d5ffefa48f840dc14ffb92874137 SHA-256: a74d7f05567e83fe403446f1118a55fa75c16e04ca204e872e8d75f9d0f0deb2
214 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for linking to malicious redirector infrastructure and for being part of a link farm. The ML classifier also strongly indicated maliciousness. The embedded URLs suggest a phishing or malware distribution scheme, where users are lured to download further malicious content.

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 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.
  • 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/123?utm_term=beast+mastery+hunter+rotation+youtube In PDF document text
    • https://cdn.sqhk.co/bidelefo/iijjiic/noweboriviwogesinunaj.pdfIn PDF document text
    • https://baxegirugono.weebly.com/uploads/1/3/5/3/135319521/86c54218a353.pdfIn PDF document text
    • https://segawalapuk.weebly.com/uploads/1/3/4/9/134902876/c317a8f.pdfIn PDF document text
    • https://cdn.sqhk.co/kekumumaxow/iflhchi/download_spin_the_battle_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/kasuwajavi/mij73jf/black_dog_wallpaper_hd_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/tewokozogop/hcjhYif/kozejelebapubolivupu.pdfIn PDF document text
    • https://vidajubobulixi.weebly.com/uploads/1/3/4/6/134650234/zimafopazefezozozu.pdfIn PDF document text
    • https://cdn.sqhk.co/wirumedaba/pecihS8/61151150289.pdfIn PDF document text
    • https://cdn.sqhk.co/kavejufa/gcvheic/amtrak_schedule_california_corridor.pdfIn PDF document text
    • https://xujufefar.weebly.com/uploads/1/3/1/4/131483110/f8d1ab7aa.pdfIn PDF document text
    • https://cdn.sqhk.co/sifalavuxozo/eWGhbic/brilliant_distinctions_app_for_android.pdfIn PDF document text
    • https://dagakaxogofawi.weebly.com/uploads/1/3/4/6/134699425/fotagugutipope.pdfIn PDF document text
    • https://cdn.sqhk.co/fudikuzi/AtlhaxS/75173580215.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://gilovimarej.epizy.com/alchemist_leveling_guide_ro_mobile.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11950 5068 bytes
SHA-256: d9ff2f8e5278b8258227a64ca564b181b769f439697d9fa71c123954b056eb2c
font_01_sfnt_off00012a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5F 11436 bytes
SHA-256: e3d2d8eab38985d794b6d805bba32761b08b42cb39cc9190c701a44e57aed09e
font_02_sfnt_off00015172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15172 16288 bytes
SHA-256: c2f59f0d99a907560a1048e7d58b70a94bd36e7c18d3b61500eee7e174469f4c
font_03_sfnt_off000166f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166F9 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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