Malicious PDF — malware analysis report

Static analysis result for SHA-256 25c1147131d34422…

MALICIOUS

PDF

67.8 KB Created: 2021-02-27 14:45:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 6e57dfdcb2df95e706c786b37bef56f9 SHA-1: 070e2c96d39ebfafb73f2f972e2321c3f7740f91 SHA-256: 25c1147131d3442258a8f9549f59683292b0d9c483036cb9880b0c61bae1d0c4
96 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 high likelihood of malicious intent. It contains an embedded URL pointing to 'midufefew.ru', which is likely part of a phishing or scam campaign. The document body, though heavily obfuscated, contains text related to battery tenders, suggesting a lure to trick users into clicking the malicious link. No scripts were extracted, but the presence of external URLs and the overall detection profile strongly suggest a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=why+is+my+battery+tender+flashing+green PDF link annotation
    • http://retamos.mygamesonline.org/how_to_interact_with_nonverbal_autistic_child.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418401/normal_6006a9087be0f.pdfIn PDF document text
    • http://mbfsopg.com/girusevivuzixejdztf5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481695/normal_5fe55fe57930b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413226/normal_6015afcfec703.pdfIn PDF document text
    • http://trokot-tonirovka.online/vifuduzuvedotodajibinupuplrfor.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418368/normal_5fe18734a1cfc.pdfIn PDF document text
    • http://kugewezebuvigiw.mygamesonline.org/cards_against_humanity_online_game_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419832/normal_5ff969432169b.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/midaguvimabof/negapuvab.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/app_agenda_delen_iphone_android.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/67641632834.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/malouf_bamboo_sheets_review.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/pathfinder_adventure_path_kingmaker_player_s_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/how_to_play_the_bongo_drums.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/behavioral_activation_therapy_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/94855132866.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_off0000ca94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA94 5576 bytes
SHA-256: 410a0955cdbe003308941dcf531ed561d592b505d3ac588031fb338559ab855f
font_01_sfnt_off0000dd6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6B 10632 bytes
SHA-256: aad0a5dab46a8866ee97ba524f9518185dd4c204e735f5c7266a84e56fb2c5cc

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