Malicious PDF — malware analysis report

Static analysis result for SHA-256 90326cfe4bb6d379…

MALICIOUS

PDF

74.3 KB Created: 2021-03-31 19:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 35ee58f2693489ed762b85edc08be25d SHA-1: 3cbc79815cac0f742c173a363c1a03c74d8ae9ab SHA-256: 90326cfe4bb6d3793f7ae330e4a9d0a2bbd3c54cd574a0c786d1f22df744337c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a deceptive link farm, likely to distribute malware or phish for credentials. The presence of external URIs and the overall structure strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://midufefew.ru/123?utm_term=learnsmart+managerial+accounting+answers PDF link annotation
    • https://ruvogoxilukab.weebly.com/uploads/1/3/2/8/132813998/cd12b3c46501a1.pdfIn PDF document text
    • http://wotidoteked.mywebcommunity.org/rca_11_galileo_pro_tablet_review.pdfIn PDF document text
    • http://sidufapas.mywebcommunity.org/kupeseseletavofexupor.pdfIn PDF document text
    • https://cdn.sqhk.co/jemitaso/P9jdcBZ/business_board_members.pdfIn PDF document text
    • http://siwivelijutore.medianewsonline.com/98357592921.pdfIn PDF document text
    • https://tetumuvagawemol.weebly.com/uploads/1/3/4/5/134522004/88118afe311a.pdfIn PDF document text
    • https://cdn.sqhk.co/kebisozakola/d9xiilr/chale_aana_lyrics_mp4.pdfIn PDF document text
    • https://cdn.sqhk.co/nobutowug/bj7haTN/anger_stick_4_mod_apk_revdl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tujefozumuresul.epizy.com/data_structures_and_algorithms_in_java_6th_edition_code.pdfIn PDF document text
    • http://dafemekadur.epizy.com/breastfeeding_tracker_app_android.pdfIn PDF document text
    • https://s3.amazonaws.com/verirejon/xinikutufilatedelor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d29cb1ba-ed43-45ac-98f7-fb16c5ec6f27/wegaded.pdfIn PDF document text
    • http://vugopumoluzunu.rf.gd/what_the_catholic_bible_says_about_marriage.pdfIn PDF document text
    • http://zamigunuzowa.epizy.com/zuzosulekoloduwuwilen.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/the_power_of_love_celine_dion_release_date.pdfIn PDF document text
    • https://s3.amazonaws.com/dogevazapiwediw/golden_software_grapher_12_free.pdfIn PDF document text
    • http://sajomapujozokux.onlinewebshop.net/my_dream_job_paragraph.pdfIn PDF document text
    • http://fizenigapajawak.epizy.com/shimla_mirchi_full_movie_filmywap.pdfIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/talodozusaluk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6432472-bf18-44ca-9a9e-6f0a6271f32a/11291727458.pdfIn PDF document text
    • http://nowimirozox.atwebpages.com/broiler_production.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_off0000e5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DF 5152 bytes
SHA-256: f4a76099a9258e782e79fc696aacd88696e9ea3b38c543b19097330e7e29ccc4
font_01_sfnt_off0000f766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF766 10620 bytes
SHA-256: 88bdebb07400d3104fdd403d6e3ec3ff23e3b7d78b7f5efe54bc81cbfd2b3024

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