Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bc6826ab0cb0b0f…

MALICIOUS

PDF

85.3 KB Created: 2021-02-16 05:29:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6cca26359abd9c3b09108ded3042b4ed SHA-1: 493de0d76245dd4a1a18127e3ae93f311ccc4656 SHA-256: 1bc6826ab0cb0b0f8cf5109b3ca9281e3f3f39c77adbef0d58e9c4f806647505
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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, with a high-priority one pointing to 'bologen.ru', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a 'critical value calculator', indicating a lure to disguise its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://bologen.ru/strik?utm_term=z+table+critical+value+calculator PDF link annotation
    • http://waneboto.66ghz.com/87078769618.pdfIn PDF document text
    • http://rapegutuxipik.22web.org/minecraft_unban_hack_mac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462697/normal_601740572a242.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483873/normal_6010c74bcdc3d.pdfIn PDF document text
    • http://jogubewuzamofet.iblogger.org/xovovotifimamipamub.pdfIn PDF document text
    • http://vinadulateg.22web.org/jumis.pdfIn PDF document text
    • http://setifol.66ghz.com/colorado_springs_police_department_theft_report.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467927/normal_5fd32f45669af.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://timodetunidup.epizy.com/6210853835.pdfIn PDF document text
    • http://favilogas.rf.gd/6032655655.pdfIn PDF document text
    • http://banobozibijur.epizy.com/xuvujufatalewomegarop.pdfIn PDF document text
    • https://s3.amazonaws.com/zulezov/92480375444.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/louis_althusser_for_marx.pdfIn PDF document text
    • http://fujebudavitasoz.epizy.com/single_digit_addition_worksheets_no_regrouping.pdfIn PDF document text
    • http://zenisuxu.rf.gd/vejadidarotik.pdfIn PDF document text
    • http://zitejilid.epizy.com/firebase_barcode_scanner_example_android.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/chopi_jesie_audiobook.pdfIn PDF document text
    • http://kodugexibitomo.rf.gd/asap_mob_wrong_instrumental.pdfIn PDF document text
    • http://xolemobubusosi.rf.gd/sugimuvidipomevesu.pdfIn PDF document text
    • http://kepikinol.epizy.com/42301471196.pdfIn PDF document text
    • http://tubafurubeg.epizy.com/original_bienenstich_rezept_springform.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/creature_3d_pk_songs_free.pdfIn PDF document text
    • http://zumuwojik.rf.gd/subject_line_for_email_asking_for_information.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_off00011232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11232 4772 bytes
SHA-256: 2500f18a772f455443b4d536318c791ee3ce7e8097f6bb85ec80b3f12042b7ec
font_01_sfnt_off00012285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12285 11084 bytes
SHA-256: 0a11e92f76da2f1e1d88352880d73b6067add8af0866268613022b7176bee79e

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