Malicious PDF — malware analysis report

Static analysis result for SHA-256 474db529b0f9cf60…

MALICIOUS

PDF

74.8 KB Created: 2021-02-03 03:43:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ce4811e84ed65b24cd55151e14cfd4c1 SHA-1: 5bdb90128c9739eee3019381b7d1ba64ccd84a47 SHA-256: 474db529b0f9cf60af0a341238a2c73d66b9b7cbffa847e8d9248907a41340fc
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains and potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' heuristics. The document body, though heavily obfuscated, suggests a lure related to 'cover letter template', which is often used in phishing campaigns. The ClamAV detection further supports its malicious nature, likely as a phishing or malware distribution tool.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jottigo.ru/wb?keyword=cover%20letter%20template%20for%20high%20school%20student PDF link annotation
    • https://cdn.sqhk.co/kopilixa/didBPib/nudefigujuzuvusikup.pdfIn PDF document text
    • https://cdn.sqhk.co/goxobuve/eicBghz/best_captions_for_instagram_post_for_boy_attitude.pdfIn PDF document text
    • https://mijipunipiju.weebly.com/uploads/1/3/1/4/131455283/c54624bc2c10.pdfIn PDF document text
    • http://modutomipofa.iblogger.org/2340443528.pdfIn PDF document text
    • https://cdn.sqhk.co/zidomirit/iP0wAcE/malayalam_funny_status_video_for_whatsapp.pdfIn PDF document text
    • http://manaluw.iblogger.org/vejofutil.pdfIn PDF document text
    • https://ruwijupoxotafan.weebly.com/uploads/1/3/0/8/130814308/sujujilowokurape.pdfIn PDF document text
    • https://cdn.sqhk.co/ragojagef/Dhg5gef/11291806751.pdfIn PDF document text
    • https://cdn.sqhk.co/jeporikate/6igijp0/new_top_10_ringtones_zedge.pdfIn PDF document text
    • https://javudufopatoka.weebly.com/uploads/1/3/1/6/131606124/2725567.pdfIn PDF document text
    • https://cdn.sqhk.co/lezebulodiw/jhsxgib/cruise_critic_carnival_breeze_deck_plan.pdfIn PDF document text
    • https://cdn.sqhk.co/bepemuno/3piaWAk/calendar_august_2020_printable_free.pdfIn PDF document text
    • https://cdn.sqhk.co/xojurolaruk/iIjbYzR/vugikuratolazupo.pdfIn PDF document text
    • https://cdn.sqhk.co/kupibetefuko/X7xw3T7/febumobobekatok.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fomabobas.epizy.com/moringa_et_ses_vertus.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/11034510490.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_off0000e694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE694 5532 bytes
SHA-256: 702af5bf1c4289c53f79d28b48d6fcdd6805343da551fa35cb0eb674f03cf824
font_01_sfnt_off0000f940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF940 11104 bytes
SHA-256: ab1bc77732a7a718169825839be55cae7c5e657fac32bb34d2a947de8cacc094

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