Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e2809fb04f7a07c…

MALICIOUS

PDF

42.2 KB Created: 2020-03-11 14:13:46 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-08-25
MD5: c7106116b666b6198c2da91987f8a906 SHA-1: 19104edd56f3029579f9d311b67958c365287292 SHA-256: 7e2809fb04f7a07c337a684ee76e09c589feffa602699331127e65d3ddd1db92
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded 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 content distribution scheme. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body is heavily obfuscated, making it difficult to determine a precise user-facing lure.

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://www.purejoys.com/uploads/1/3/0/5/130539936/130539936.html#reading+sheets+for+3rd+graders PDF link annotation
    • http://ellenleventry.com/uploads/1/3/0/8/130874197/dokika_xetasuwinugako_bepakonotolemig.pdfIn PDF document text
    • http://multifaithstorytelling.org/uploads/1/3/0/6/130621167/jikomadupavupaluwu.pdfIn PDF document text
    • http://tristamalexander.com/uploads/1/3/0/3/130313783/rudetu-mesawiwenego-lodotaloj.pdfIn PDF document text
    • http://rlconstructionwa.com/uploads/1/3/0/5/130545957/balakogimutiw_risopobupodan_sogobeso.pdfIn PDF document text
    • http://www.thelittlefarmnz.com/uploads/1/3/0/4/130488387/a7fc414b0.pdfIn PDF document text
    • http://michaelanthonyshairanskin.com/uploads/1/3/0/7/130776068/rovalujanov-fixajuwi.pdfIn PDF document text
    • http://calisthenicsonline.com/uploads/1/3/0/5/130541209/2978674.pdfIn PDF document text
    • http://www.shopmantrajewelry.com/uploads/1/3/1/0/131070846/vejurafiteb-jamupur-mujatasozejem-zonivozejumanav.pdfIn PDF document text
    • http://sideoftheroad.life/uploads/1/3/0/6/130640020/d731e2c4c6bb6.pdfIn PDF document text
    • http://ovospitanii.site/uploads/1/3/0/5/130550948/8194928.pdfIn PDF document text
    • http://www.beastedart.com/uploads/1/3/0/6/130620971/wepoxulokovuti.pdfIn PDF document text
    • http://www.midhudsoncpr.com/uploads/1/3/0/2/130288458/kujemozofugikob_jokexi.pdfIn PDF document text
    • http://12ster.com/uploads/1/3/0/6/130621516/pukove-vekivapipus-gagaf.pdfIn PDF document text
    • http://allberta.com/uploads/1/3/0/3/130313440/ledivib.pdfIn PDF document text
    • http://tribelicious.com/uploads/1/3/0/4/130476563/442115.pdfIn PDF document text
    • http://badbananaclothing.com/uploads/1/3/0/7/130776716/9fe861570af.pdfIn PDF document text
    • http://audiopron.com/uploads/1/3/0/2/130288761/ec06cc2dd931fb.pdfIn PDF document text
    • http://www.chinainvestco.com/uploads/1/3/0/4/130483322/bezakawuvuv.pdfIn PDF document text
    • http://speerinteractive.com/uploads/1/3/0/4/130435646/jotan.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
🗂 Part of campaign: 12ster.com 5 samples

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007bd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BD9 8140 bytes
SHA-256: 725ea9aefc7a71e0772e54967e7f857000c7331c47bb46baf7e6a66e3169ae1b