Malicious PDF — malware analysis report

Static analysis result for SHA-256 efda2690b75c9746…

MALICIOUS

PDF

68.5 KB Created: 2021-02-10 12:03:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d3e2ffce62d938b0d59160ca511778f4 SHA-1: 0311dd046ee6584af572667268ef39aea9da11c9 SHA-256: efda2690b75c97466263b71a272129ec2a17c1b78afb7a64578760187e32b8a7
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of embedded URLs, many of which point to disposable hosting and are likely part of a link farm designed to redirect users to malicious sites. The presence of 'utm_term' parameters suggests an attempt to track user engagement with these lures.

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://jacksth.ru/123?utm_term=fremont+county+iowa+gis PDF link annotation
    • https://nexudusuje.weebly.com/uploads/1/3/0/7/130740550/zovevogogogepit-mugip-sibisozofax-deguxonexo.pdfIn PDF document text
    • http://pomurofame.iblogger.org/awesome_icons_full_apk.pdfIn PDF document text
    • http://getcreditcheck.info/android_version_oreo_logos93jd.pdfIn PDF document text
    • http://timecodes.net/443696846079p19h.pdfIn PDF document text
    • http://gratoramaa.website/rapupijeganugisatebusibga4qz.pdfIn PDF document text
    • http://neuroncraft.online/call_of_duty_sound_effectsi7yjc.pdfIn PDF document text
    • http://jotepuxigavof.iblogger.org/burdened_with_crossword_answer.pdfIn PDF document text
    • http://worldhold.online/estimacion_de_parametros_estadisticaw92v3.pdfIn PDF document text
    • http://sportplays.ru/rowenogasuliliwaef2.pdfIn PDF document text
    • http://static-get.top/huey_p_newton_parentsuai5s.pdfIn PDF document text
    • http://raifaisentapp.online/dezopagibife841zw.pdfIn PDF document text
    • http://palumurawisan.22web.org/58989585934.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/jizubisetebof/hd_wallpapers_for_pc_free_cars.pdfIn PDF document text
    • http://ragigixo.epizy.com/baarish_ka_mausam_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/geography_quiz_questions_and_answers_2017.pdfIn PDF document text
    • http://magikid.epizy.com/assam_police_admit_card_2018.pdfIn PDF document text
    • http://nefaped.epizy.com/39936431854.pdfIn PDF document text
    • http://natexekazedap.epizy.com/cff_explorer_windows_xp.pdfIn PDF document text
    • https://s3.amazonaws.com/vexeliku/contractor_acknowledgement_form_template.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_off0000cf79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF79 5236 bytes
SHA-256: a8aed942b6cdfc224265da4524271ad426019e6bcdc7024e355b9c0156b1b362
font_01_sfnt_off0000e151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE151 10488 bytes
SHA-256: c626f1d1825eaaaf42fd80b50655a8a62244e8cf9b66ecf58c958c388aa2b3ff

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