Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2eec57dd7c64184…

MALICIOUS

PDF

79.1 KB Created: 2021-03-17 04:23:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 71819105f6ed04e1b00737d7acee033e SHA-1: bcdf4e89c6a5b7c50a3c2f4db618f606069377f7 SHA-256: e2eec57dd7c64184483561251b2c8d1af8b321e16a8c14b094e7274a06868b3d
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs, with one specifically pointing to a URL that appears to be a lure for a "new uc browser app for mobile". The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of numerous links on disposable hosting further supports a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://xezojetit.ru/123?utm_term=new+uc+browser+app++for+mobile
    • https://pubedazemel.weebly.com/uploads/1/3/4/8/134870130/murebowixoleweb.pdf
    • https://static.s123-cdn-static.com/uploads/4469841/normal_5ff4d98d5720d.pdf
    • https://cdn-cms.f-static.net/uploads/4487194/normal_601ae506e5dc8.pdf
    • http://strapslap.online/kusarolejatefusct9v.pdf
    • https://demuxovepeb.weebly.com/uploads/1/3/4/3/134311881/zefuvodo.pdf
    • https://cdn-cms.f-static.net/uploads/4469350/normal_600b081560462.pdf
    • http://kmplitka.shop/21134123284ju7tr.pdf
    • http://private-channel.site/an_introduction_to_film_genres_freedslt7.pdf
    • https://gifonoxudofi.weebly.com/uploads/1/3/4/3/134322056/eab69c.pdf
    • https://static.s123-cdn-static.com/uploads/4387419/normal_5ff59f19aae63.pdf
    • https://sutudaxete.weebly.com/uploads/1/3/4/4/134497902/lugumoripijawupabaka.pdf
    • http://xuvaxujogilo.mygamesonline.org/59434916719.pdf
    • https://remoruputudedux.weebly.com/uploads/1/3/4/0/134017090/dawuwuzimojadam.pdf
    • https://cdn-cms.f-static.net/uploads/4453100/normal_604b1c1edd94f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://subogerilazelo.atwebpages.com/statistical_hypothesis_test.pdf
    • http://zukufefomuzaz.epizy.com/10864605449.pdf
    • https://uploads.strikinglycdn.com/files/a5992565-6696-439c-90a5-a8613874dd9a/94708809663.pdf
    • https://uploads.strikinglycdn.com/files/12862efc-999a-4a7b-9950-b42aeb1a74ff/briggs_and_stratton_500_series_158cc_spare_parts.pdf
    • https://uploads.strikinglycdn.com/files/978b9882-9925-42b7-8012-6ee38b1cbe4e/garmin_etrex_12_channel_gps_instructions.pdf
    • https://uploads.strikinglycdn.com/files/5af672fd-a453-410e-8d60-b4fbf3829f03/femuboxamabumifizikexif.pdf
    • http://tenurusimuxu.epizy.com/masterarbeit_informatik_anforderungsanalyse.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea01.bin
2dda8f0ee0d7e38f739b1578c0679579cd569b50064206cc897ca1f634f4183d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA01 5056 bytes
font_01_sfnt_off0000fb41.bin
dd31cdba8ae41c48289e19547de4c8571d98bd700f75b054fa4acb548ae99080		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB41 11112 bytes
font_02_sfnt_off00012136.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12136 4324 bytes

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