Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a130f6e51e0744d…

MALICIOUS

PDF

78.1 KB Created: 2021-03-08 18:48:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 8373f3fa195f890c97982a0eeac7cd82 SHA-1: b81fa69f331fdbe918549b438f47428f21988ca0 SHA-256: 6a130f6e51e0744dd407298b4fdc5d73a8f5a1735bc7aadf3e7b0c45fd17a3ac
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains and link farms, indicating a phishing or scam attempt. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://maypoin.ru/aws?utm_term=ryobi+2700+psi+pressure+washer+air+filter PDF link annotation
    • https://cdn.sqhk.co/wigalefu/hhnhbaB/nostalgia_gba_emulator_apk.pdfIn PDF document text
    • http://fotonagosuslugi-01.space/msc_maths_entrance_exam_question_papers_with_answers7k6p3.pdfIn PDF document text
    • http://komaxinatobofe.medianewsonline.com/waterpik_water_flosser_cordless_select_review.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/bnJhh4K/33903489886.pdfIn PDF document text
    • http://feelslike35.com/video_er_for_mac_2018iepc1.pdfIn PDF document text
    • http://gepokupaburorew.mywebcommunity.org/traitement_carie_dentaire.pdfIn PDF document text
    • http://temilops.xyz/xigagupiromefiltbbcf.pdfIn PDF document text
    • https://cdn.sqhk.co/vavapezami/jcgfijZ/royal_splendor_hosta.pdfIn PDF document text
    • https://cdn.sqhk.co/kixagixupo/e5diMgf/baby_flashcards_for_toddlers_printable.pdfIn PDF document text
    • http://ionatr.space/kegunodccwm0.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/rupatojuko/19207675146.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c37b164-d6bd-46d3-8fd8-19b501a0fce5/dirizapawanawelepenib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d165b29-5512-43b2-a214-305c0c16483e/luvivipakelatisebu.pdfIn PDF document text
    • https://s3.amazonaws.com/sojuravewi/bass_boosted_songs_free_320kbps.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/76951724495.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/2013_mercedes_c300_4matic_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/44468283634.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb6062d1-da30-4dca-8b62-3de900afd67e/brother_hl-2240d_driver_windows_xp.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_off0000f22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22A 5684 bytes
SHA-256: 4a5a15418fd607a3f33c9721f4b5aa61532816fc189457b575912695f6c0b633
font_01_sfnt_off000105a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A1 11260 bytes
SHA-256: a18cf157e9db10b96e7994303838446731908948873ab4d6c32f755855a7af6c

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