Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc8ace57d7f9e3ef…

MALICIOUS

PDF

79.3 KB Created: 2021-02-16 22:59:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: da8d217b32201285d64c05753896c724 SHA-1: 37c0f87453501287114936c08041c85dc362e4b7 SHA-256: cc8ace57d7f9e3efe67911e2f446cb7ad737f39e5dc0a4570dc11b08b11ce09f
184 Risk Score

Malware Insights

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

This PDF document is classified as malicious due to its use of multiple embedded URLs pointing to redirectors and link farms hosted on disposable domains. The document body, though heavily obfuscated, appears to be a lure related to salary information, aiming to trick users into clicking malicious links. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL leading to known malicious infrastructure, indicating a phishing or malware distribution attempt.

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
  • 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 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.
  • 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://crophysi.ru/strik?utm_term=how+much+do+dentist+hygienist+make+an+hour In PDF document text
    • https://gebapawuvafiv.weebly.com/uploads/1/3/4/5/134519736/2595134.pdfIn PDF document text
    • https://cdn.sqhk.co/kavuluxaja/Y3jhmdh/water_parks_open_near_me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487208/normal_600c136d28876.pdfIn PDF document text
    • https://fujifarilopo.weebly.com/uploads/1/3/4/4/134483008/673436.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457298/normal_60246b69e0ddd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448727/normal_6006fd709cf19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464715/normal_5feaeb55d32ea.pdfIn PDF document text
    • http://pabazumakubonok.66ghz.com/geometric_sequence_and_series_practice_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/vofaruvukuk/hgjNoib/bright_dots_in_eyes.pdfIn PDF document text
    • https://sijetuso.weebly.com/uploads/1/3/4/4/134499475/terim_vofufovagexen_lusarir_maseravonuva.pdfIn PDF document text
    • https://cdn.sqhk.co/migixurej/iA9jj0I/96235581757.pdfIn PDF document text
    • https://cdn.sqhk.co/mofijovelu/ifjiijH/dugibeb.pdfIn PDF document text
    • https://fitarerak.weebly.com/uploads/1/3/5/3/135313257/komuk.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://fabowifomewod.epizy.com/aankhen_1993_full_movie_free_mp4.pdfIn PDF document text
    • http://nifubaj.rf.gd/rofilosov.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/admob_android_adalah.pdfIn PDF document text
    • http://vudunebavibag.epizy.com/kazebuda.pdfIn PDF document text
    • http://makekafes.epizy.com/assi_trendsetter_hd_song.pdfIn PDF document text
    • http://golofupatawef.epizy.com/linev.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB9 5424 bytes
SHA-256: 90e9347a7a63c0555147b17faba818f8be2b30f31116bddb48a380805f2e22cb
font_01_sfnt_off0000fd13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD13 10672 bytes
SHA-256: 0b3d1b088620fce6993cd12d89e5a1d13cadc62709d816182a50bc2daf482c0b
font_02_sfnt_off00012190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12190 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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