Malicious PDF — malware analysis report

Static analysis result for SHA-256 437fc19372a0e690…

MALICIOUS

PDF

86.4 KB Created: 2021-05-13 10:25:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c7b8128389441aa084236af38a266920 SHA-1: 6b45649a4c7f928db4447c9b45819d1e543d14cb SHA-256: 437fc19372a0e69089f0c912ac014c4f128202feff91752da9e5fc033c52a9e0
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic firings indicate the document is a link farm on disposable hosting, designed to redirect users to potentially malicious sites. While no scripts were extracted, the presence of malicious links and the ML classifier's high confidence suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://yafferge.ru/strik?utm_term=outlander+books+hardcover In PDF document text
    • http://kaxiwemusemoj.mypressonline.com/frases_utiles_en_ingles_para_viajar.pdfIn PDF document text
    • https://vexibalob.weebly.com/uploads/1/3/4/8/134896466/04006b3c.pdfIn PDF document text
    • http://zumofujej.iblogger.org/parquet_file_format_data_types.pdfIn PDF document text
    • http://fibisazorowax.mypressonline.com/anyway_you_can_annette_bosworth.pdfIn PDF document text
    • https://zefutijokizire.weebly.com/uploads/1/3/4/8/134868110/174933.pdfIn PDF document text
    • https://vudubigudimuw.weebly.com/uploads/1/3/4/0/134016717/bekoj_miwev_bazamoxu.pdfIn PDF document text
    • https://radetotoko.weebly.com/uploads/1/3/4/6/134697609/vevateka-mowozesaxebebi-xukav-zufubuluvuzo.pdfIn PDF document text
    • http://mofobawosenej.mygamesonline.org/yamaha_portable_grand_dgx-500_manual.pdfIn PDF document text
    • https://lisiruzefixa.weebly.com/uploads/1/3/4/4/134495270/tevokovotaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dijovoxokad.rf.gd/algorithms_4th_edition_by_robert_sedgewick.pdfIn PDF document text
    • https://d1159ab4-cbf5-42eb-897b-83a5e94cd7da.filesusr.com/ugd/536122_5d302952319940cf96c1ee9b9452f60d.pdf?index=trueIn PDF document text
    • http://ribitotuv.epizy.com/72708817108.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/73666815047.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/firmenich_international_sa_annual_report_2018.pdfIn PDF document text
    • https://8c4778c4-ed17-4cf1-86f9-5448e21c5c15.filesusr.com/ugd/6da380_5ab17458238f486c953af402d73487df.pdf?index=trueIn PDF document text
    • http://wowijikozo.epizy.com/dudowajonavinud.pdfIn PDF document text
    • https://76f5a3e5-08d8-4581-9975-6c1b933a1845.filesusr.com/ugd/dbbd16_49e5c36aba07449695b2ab4186fab176.pdf?index=trueIn PDF document text
    • http://wikugojumoxo.epizy.com/free_version_of_microsoft_office.pdfIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/donosirinewofipoxel.pdfIn PDF document text
    • https://s3.amazonaws.com/dazuxujepov/banner_maker_pro_free_crack.pdfIn PDF document text
    • http://gefuxexo.epizy.com/agglomerative_information_bottleneck_method.pdfIn PDF document text
    • http://refipazak.epizy.com/job_sheet_meaning_in_english.pdfIn PDF document text
    • http://reguturutomasut.rf.gd/renaissance_periodisation.pdfIn PDF document text
    • http://kokokifutalikop.epizy.com/chicago_assyrian_dictionary.pdfIn PDF document text
    • https://s3.amazonaws.com/tamovagag/what_vegetable_should_you_eat_everyday.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_off000111e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E7 5320 bytes
SHA-256: 63e8cf1d541710ec4c7a3de6f11b520cdc982919492af3216bed55837d04c316
font_01_sfnt_off000123f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F5 11912 bytes
SHA-256: 30b52a5278e6f5cac56f63ef6b8e828c6626e9ab82b1f41293476c2c55a67138