Malicious PDF — malware analysis report

Static analysis result for SHA-256 be73a91e75389920…

MALICIOUS

PDF

70.3 KB Created: 2020-03-11 10:47:52 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-07
MD5: a4be39cf981ad8e335ff4e14016f959d SHA-1: 1e80abe25ed6685776262e69997e82b63ec6d2d2 SHA-256: be73a91e75389920fcfc8aff01e70b77742c4a8988a93bfe9fef7dc6eb4b9fdc
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links to other PDF files hosted on various domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. The ML classifier strongly supports the malicious verdict. No scripts were extracted from this sample, limiting the ability to determine specific payload delivery or execution methods.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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 http://chuzhappy.com/uploads/1/3/0/6/130621305/130621305.html#chinese+love+poem+english+translation PDF link annotation
    • http://peragastronomie.com/uploads/1/3/0/5/130588257/5637449.pdfIn PDF document text
    • http://freespiritleisure.online/uploads/1/3/0/6/130639532/vasigiwilefi.pdfIn PDF document text
    • http://www.aminuteforlittlethings.com/uploads/1/3/0/6/130605216/pifikefov.pdfIn PDF document text
    • http://silverlineinvestments.com/uploads/1/3/0/5/130542780/8a5bb553cd0.pdfIn PDF document text
    • http://shofarart.com/uploads/1/3/0/6/130639896/d371003c0e.pdfIn PDF document text
    • http://athleticspark.com/uploads/1/3/0/4/130476248/7ae3977adfafad.pdfIn PDF document text
    • http://fri.center/uploads/1/3/0/4/130478602/2c46305c8abe7d.pdfIn PDF document text
    • http://dry-2-go.com/uploads/1/3/0/6/130604505/3a325cd30f1.pdfIn PDF document text
    • http://mazuz.net/uploads/1/3/0/4/130490665/5058705.pdfIn PDF document text
    • http://rawk-cbd.online/uploads/1/3/0/5/130590738/500ecd89ae.pdfIn PDF document text
    • http://peaksmobile.com/uploads/1/3/0/6/130639770/sirixev.pdfIn PDF document text
    • http://www.cbamanagement.nl/uploads/1/3/0/9/130969536/bivowigu-nuwuludexolal-nikur-noreme.pdfIn PDF document text
    • http://www.thevaultofgod.com/uploads/1/3/0/5/130589238/7805420.pdfIn PDF document text
    • http://www.listmomla.com/uploads/1/3/0/6/130605509/2343495.pdfIn PDF document text
    • http://ncdg.store/uploads/1/3/0/8/130813054/7578236.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://www.adobe.com/).NotoIn PDF document text
    • http://www.google.com/get/noto/http://www.adobe.com/type/ThisIn PDF document text
    • http://scripts.sil.org/OFLNotoIn PDF document text

Related samples 1

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000074f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74F8 7996 bytes
SHA-256: 74c37d666679fe656466b19f284680f6e9c2ab53d24d68a61acf23e764afe5d6
font_01_sfnt_off000093ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93CA 38612 bytes
SHA-256: 79c7fe5e380677dc97621353eb7dc966836eb0357d2eaf8087bc7460eb63d1d1

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