Malicious PDF — malware analysis report

Static analysis result for SHA-256 b625ad3e83df0eb8…

MALICIOUS

PDF

83.5 KB Created: 2021-09-13 13:26:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3f82c898b036f8221653618df0440a5a SHA-1: afad388a980a254e4a5bc2b9645fd8a6063e4d09 SHA-256: b625ad3e83df0eb8bc94b988669b26658e0a344aa850eec65f96008486bd7360
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous embedded URLs, many pointing to disposable domains, and one heuristic specifically identified it as a link farm. The presence of external URIs suggests an attempt to redirect the user to malicious content or further stages of an attack.

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 http://euro520.net/userfiles/file/1631505739867690287.pdf In PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/dekabov.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/sirogigefemuvuf.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/wimudomojasekadibamarabov.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/pabenixulafuzonar.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/45618031675.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/fidususuvefivusegarume.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/vibevub.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/28484571215.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/35340305406.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4a1380de9---risozuravejeruwatirorejok.pdfIn PDF document text
    • http://mqskin.com/luutru/files/89809410874.pdfIn PDF document text
    • https://vitanov.rs/files/vubemabobarasenatoj.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/woxerafovoworar.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/78746935723.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/42112318056.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/17886850920.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/21049586780.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/14378613164.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/80043601224.pdfIn PDF document text
    • http://emeat.ru/var/files/vomitabaromopodidimurigud.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/62807162011.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/73019548623.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=latest+android+updatePDF 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_off0000e0b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B5 10396 bytes
SHA-256: bfd2fdd09a20e7a40e772b9b5755442c758eadf81832a2a864ba8ae3f05e6361
font_01_sfnt_off0000f852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF852 18440 bytes
SHA-256: 5350c21357d5311da319455cb5eba91428b46cc033680fb3506b2e84a949537f
font_02_sfnt_off00012862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12862 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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