Malicious PDF — malware analysis report

Static analysis result for SHA-256 69d0827e55367b9f…

MALICIOUS

PDF

80.5 KB Created: 2021-09-08 21:36:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b8b9113f942ea251b160da0de8d27aee SHA-1: 493b4ccce16d3530a26a366427b067d150d43870 SHA-256: 69d0827e55367b9f5adc73fffbaf4c8eccc486669a02750411365049426561e6
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The PDF structure and the presence of many links suggest an attempt to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://quatcongnghieput.com/uploads/files/xagivotakaw.pdf In PDF document text
    • http://kozszemle.hu/uploads/files/78648465895.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/gogikabitewufaki.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/taribunuwonapadawib.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/77242229242.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/717606059.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/53594906503.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/92731049381.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/25249524695.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/79026476806.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/81213199.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/45674874889.pdfIn PDF document text
    • http://mtegl.wsystem.sk/userfiles/files/visinemedelur.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/jiwozebu.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/wifafalosazidofijam.pdfIn PDF document text
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/gewufekamor.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612eff75b19eb---sonimerevepazi.pdfIn PDF document text
    • https://dhesient.com/media/92641474370.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/texutape.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/26840940788.pdfIn PDF document text
    • http://tech-sub.com/userfiles/file/91289959084.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/xisulidopazaxepapopemu.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eec3d02064---devibedinu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=perimeter+worksheets+6th+gradePDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43E 10892 bytes
SHA-256: c6155df0bf7acb8d64c0f4e2d5ea6f71a6301f086c7c92098e3fb957db18a9a9
font_01_sfnt_off0000ed65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED65 18084 bytes
SHA-256: f1ba59d7f32bda7e87562bb8350830e8cf7c900c59298ad2314dc58c09c3c6d5
font_02_sfnt_off00011c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1