Malicious PDF — malware analysis report

Static analysis result for SHA-256 4da60643a06b1e0e…

MALICIOUS

PDF

73.1 KB Created: 2021-01-31 09:53:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: fca20f7b204ec54eee8794b9d1fa1f72 SHA-1: f8156711ccd85a5c3631fcb65779924905300e81 SHA-256: 4da60643a06b1e0eb17eb8ce3582cf12e1b818e6fab7aa9dcb0eae53905be9f1
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one specifically noted as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful external content.

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://jacksth.ru/aws?utm_term=clipsal+2000+series+switch+pdf PDF link annotation
    • https://xokekujederal.weebly.com/uploads/1/3/0/9/130969763/a605300408.pdfIn PDF document text
    • https://nojabepeteguki.weebly.com/uploads/1/3/4/6/134669956/e4f5d822863ad1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415045/normal_5fe7540e785e2.pdfIn PDF document text
    • http://circleshtang.xyz/aulas_de_desenvolvimento_vale_do_amanhecerapg4w.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381962/normal_5ff0d13f291c4.pdfIn PDF document text
    • http://cosmostil.top/xejikiwunomuwegavugugexouf92s.pdfIn PDF document text
    • http://runatem.66ghz.com/zukex.pdfIn PDF document text
    • http://helpcopyright-service.com/road_racing_wheels_size6tcf9.pdfIn PDF document text
    • http://shoop-fm.ru/need_for_speed_most_wanted_apk_mod_ioswsivx.pdfIn PDF document text
    • https://sizegetode.weebly.com/uploads/1/3/4/3/134309939/peluwexi_dekav.pdfIn PDF document text
    • http://likelid.xyz/meals_on_wheels_bronx_nyafs2s.pdfIn PDF document text
    • https://lerelapukuvi.weebly.com/uploads/1/3/0/7/130740054/db05cf12582e.pdfIn PDF document text
    • https://motadonikedubi.weebly.com/uploads/1/3/1/8/131856170/nojov-nekoliganu-zaputafa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kazoverowagodi.epizy.com/the_brink_movie_480p.pdfIn PDF document text
    • http://rowavironipomiz.epizy.com/html5_email_marketing_templates.pdfIn PDF document text
    • http://doxekapop.rf.gd/operasi_bilangan_biner.pdfIn PDF document text
    • http://kijijaxozaro.epizy.com/78462559551.pdfIn PDF document text
    • http://dewelimu.epizy.com/wabekilukariwef.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C3 5204 bytes
SHA-256: b193b50e70c82366d14ea053da82200107f1838711c9390a3d0f6a98cd297241
font_01_sfnt_off0000d88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88D 6148 bytes
SHA-256: 0b38f6fd5e0b54bfa22d5adee1cfe00629fe134100fc7cfc1ad14a2ab7974207
font_02_sfnt_off0000e86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86C 9524 bytes
SHA-256: b6883df716a13744d9f8002b18625765ae49bbbe28f7e68c6827c8b9abdced53
font_03_sfnt_off000108da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DA 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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