Malicious PDF — malware analysis report

Static analysis result for SHA-256 a80b1c21b59e568c…

MALICIOUS

PDF

111.7 KB Created: 2021-02-19 17:12:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 90d7dfc7baff69a22322fb300c8f44d6 SHA-1: 1b2db20be2b40403eaef023906feceb06d3e44c3 SHA-256: a80b1c21b59e568c702c77b8c48c239021c34b962eb6311a59b17641e030a180
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to suspicious domains and identified as a link farm. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate a strong likelihood of malicious intent, likely to redirect users to phishing sites or download further malware. The ML classifier and ClamAV detection further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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=dialectical+behavior+therapy+self+help In PDF document text
    • http://laxeded.iblogger.org/great_is_thy_faithfulness_satb.pdfIn PDF document text
    • https://zabugejagovim.weebly.com/uploads/1/3/1/6/131637755/tekobovavugodatuwo.pdfIn PDF document text
    • https://geliwesirodired.weebly.com/uploads/1/3/1/3/131382982/mefesenematoluvidura.pdfIn PDF document text
    • https://weralafopibobal.weebly.com/uploads/1/3/4/3/134338927/d044998fbaf607.pdfIn PDF document text
    • https://suzagosezamonu.weebly.com/uploads/1/3/4/4/134446802/kujufaxadebu.pdfIn PDF document text
    • https://jawoxufogor.weebly.com/uploads/1/3/6/0/136022219/605407.pdfIn PDF document text
    • http://negimemexib.iblogger.org/38708792738.pdfIn PDF document text
    • https://jaxedafotonomut.weebly.com/uploads/1/3/4/8/134885779/pupudefeb-weporudivutoma-ragepimilawudo.pdfIn PDF document text
    • http://miworusak.iblogger.org/android_emulator_not_connecting_to_internet.pdfIn PDF document text
    • https://xanuzelikaba.weebly.com/uploads/1/3/4/8/134889809/1827628.pdfIn PDF document text
    • https://leresidatebij.weebly.com/uploads/1/3/0/7/130776374/tefasuvivivedu.pdfIn PDF document text
    • https://dizogesutupini.weebly.com/uploads/1/3/4/6/134631076/dobepidu_nodasafab_nerukurofujug.pdfIn PDF document text
    • http://betixisu.22web.org/bharat_movie_trailer_video.pdfIn PDF document text
    • https://vikumufum.weebly.com/uploads/1/3/1/3/131398575/3833546.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/aadhar_card_kaise_kare_mobile_se.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/42221902292.pdfIn PDF document text
    • http://nawatelobuj.rf.gd/radidebupaxar.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_off00017831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17831 5404 bytes
SHA-256: 81fbf7962d992e23bad17f872a54d9f3ec833292a5b6fe655b5616f7c0268a6e
font_01_sfnt_off00018a97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A97 11768 bytes
SHA-256: 1e979ead778a647da85140434b87d742d14d95473ace7a6c9d5cefbd2ae15278

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