Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d87fec0dab278d2…

MALICIOUS

PDF

47.2 KB Created: 2020-04-01 17:15:47 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-07
MD5: 78d56e8e9a97c633c291578602e06158 SHA-1: 2bcc46ee3e92ebaaa72a8834205d4b7c117cab7d SHA-256: 4d87fec0dab278d26f253f5863f3291203023ad945aaacca867e35e1cda5f2ef
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on different domains, suggesting a link farm or SEO poisoning tactic. The document body contains garbled text and what appears to be metadata from the wkhtmltopdf tool, but the primary malicious activity is the distribution of these numerous external links. No scripts were extracted from this sample.

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://vidhimashetty.com/uploads/1/3/0/3/130379427/130379427.html#propiedades+aproximacion+normal+binomial+media+varianza+y+desviaci%C3%B3n+est%C3%A1ndar PDF link annotation
    • http://learnwithstarc.com/uploads/1/3/0/5/130589399/2839b21.pdfIn PDF document text
    • http://www.shannonbrownactor.two9productions.com/uploads/1/3/0/8/130813777/7042100.pdfIn PDF document text
    • http://francoisetmimi.com/uploads/1/3/1/1/131164118/ed9e57558988.pdfIn PDF document text
    • http://kbopureheartsministry.org/uploads/1/3/0/7/130776403/309654.pdfIn PDF document text
    • http://atoz-builders.com/uploads/1/3/0/8/130814009/kinisukux_letitafilexaje.pdfIn PDF document text
    • http://globalgraderealestates.com/uploads/1/3/0/3/130323286/12e99465b2d1e23.pdfIn PDF document text
    • http://finalnightmare.com/uploads/1/3/0/2/130289663/4812840.pdfIn PDF document text
    • http://officedecolombia.co/uploads/1/3/0/5/130590469/solufalutasutitosupo.pdfIn PDF document text
    • http://izzaizelan.com/uploads/1/3/0/7/130740224/acaf3f9876.pdfIn PDF document text
    • http://bloomwithgraceblog.com/uploads/1/3/0/2/130291592/xisaladinun.pdfIn PDF document text
    • http://embarkdancetheatre.com/uploads/1/3/0/4/130476506/ribome_linepeli.pdfIn PDF document text
    • http://mrhastieptyltd.com/uploads/1/3/0/9/130969474/rarosanupaj_jusomuge_saxeji_saginarigobida.pdfIn PDF document text
    • http://foodstream.info/uploads/1/3/1/3/131384044/xeridijugepuv_jajijukim_vigenef.pdfIn PDF document text
    • http://cborgescobrancas.net/uploads/1/3/0/5/130588856/rabivelelanugoz.pdfIn PDF document text
    • http://1e-mail.com/uploads/1/3/0/2/130288684/ralupefibeja.pdfIn PDF document text
    • http://5starjanitorialservices.org/uploads/1/3/0/9/130969983/b34383fe.pdfIn PDF document text
    • http://sundaygroceries.com/uploads/1/3/0/6/130605164/milimewip.pdfIn PDF document text
    • http://cadeaudlove.com/uploads/1/3/0/8/130813756/2256253.pdfIn PDF document text
    • http://infinitopunto0.com/uploads/1/3/0/4/130488243/sudebif.pdfIn PDF document text
    • http://himalayansaltlampusa.com/uploads/1/3/1/0/131070645/77a290.pdfIn PDF document text
    • http://iamkennywilson.com/uploads/1/3/0/6/130621503/287e4dd930fcf2.pdfIn PDF document text
    • http://aaaheating-acrepairtolleson.com/uploads/1/3/0/6/130622084/funokufosuw-fifujomutizene-jogijafefudaja-fupomefebanewaz.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

Related samples 1

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

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8643 10316 bytes
SHA-256: 40c71a5bb3311064a153507fb4cfda278b2b3b608e55fa72ee528f0daf2b44c6

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