Malicious PDF — malware analysis report

Static analysis result for SHA-256 05bc9b1e8fd17afe…

MALICIOUS

PDF

74.6 KB Created: 2021-04-03 17:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: cc6721f5be9ec64a332e32e05e160387 SHA-1: e93fd714451f118d9c66b82779e34f61217dce85 SHA-256: 05bc9b1e8fd17afeb567eff6edc7ebf96fea71cba44fbffcb34b51137bc1eaff
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/award?keyword=fundamentals+of+industrial+chemistry+pdf PDF link annotation
    • http://kyukty68.xyz/bumusizumemefabibisazefss8mk.pdfIn PDF document text
    • http://womans30planet.com/74790763757u1tgw.pdfIn PDF document text
    • http://sberbank.link/phn_mm_dch_ting_anh_sang_ting_vit_filetj4l7.pdfIn PDF document text
    • http://badodamibevije.iblogger.org/27230834758.pdfIn PDF document text
    • http://tryporte.xyz/611428594168k5sq.pdfIn PDF document text
    • http://vnds-super.space/spanish_verb_conjugation_chartinajy.pdfIn PDF document text
    • http://thefortykuti.com/maths_formulas_for_class_7_download5hcx2.pdfIn PDF document text
    • http://parhelifrl.space/fulozelomegunarawizojupemhua43.pdfIn PDF document text
    • http://ing-jobs-opportunities.com/2068791498336zsm.pdfIn PDF document text
    • http://aires.fun/brady_handimark_tls2200_manualimr6g.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wunizazug.rf.gd/bagpipe_music_writer_gold.pdfIn PDF document text
    • http://gunuguduwurenog.epizy.com/occupational_health_and_safety_green_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de39cda8-5f29-492a-a53a-d9532657a2f1/88118304959.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1358b4d0-bcc4-43a3-8d34-27b8d50fa73b/avital_5303_instruction_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45705322-f31b-4cd2-98cb-38219601bc4f/on_the_road_to_mandalay_lyrics_kipling.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/820b9ac7-d085-46aa-9e4a-f6eeb98a2144/54621849275.pdfIn PDF document text
    • http://vaxomuterok.epizy.com/medullary_thyroid_cancer_guidelines_2015.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/536064a9-06e3-4596-9377-d0db0820ded0/how_to_turn_off_samsung_galaxy_a10e_without_password.pdfIn PDF document text
    • http://daxukutotexodu.rf.gd/biological_approach_to_psychology_means.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_off0000e367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE367 5452 bytes
SHA-256: 0de292369698ee9343c0a0ec3383db8d052e3e1cefede584dab80e05274e5f06
font_01_sfnt_off0000f5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D1 11004 bytes
SHA-256: 3cf470b7a87c87621b74115e3f1de214875a507260a15f72bc22a07a5e20fbd4

Open this report in the interactive analyzer, or submit your own file for analysis.