Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f178081fa49284f…

MALICIOUS

PDF

71.1 KB Created: 2021-09-29 02:35:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 171a1cfd89c1935e6fb4bb3c5df89168 SHA-1: f56f46a028085a9ebfa2cd0fe11c2f2e76f683ad SHA-256: 0f178081fa49284fad653a15e19add9c4062ebb2d7ef0dbe73121cfd8d4ea8df
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, a common technique for phishing and malware distribution. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133b356c9b11---75384657665.pdf In PDF document text
    • http://abwlanham.com/uploads/files/nifexisovolokabog.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/63997798391.pdfIn PDF document text
    • http://kieryk.pl/img/userfiles/file/sanejubote.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/kizisis.pdfIn PDF document text
    • http://ssss-sangam.com/userfiles/file/27680929988.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/sasipupuj.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130121e20bfe---43833443388.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/18905774550.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/93781643514.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/pokumizutefedopefafu.pdfIn PDF document text
    • http://geasit.it/userfiles/files/mopov.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/mozutuwatafolenujerekajif.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/21683412343.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/43895558599.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/47255318269.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/8305238406.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/51942846237.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/wasuxolasebelazasuzemi.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/bowiti.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/30497858078.pdfIn PDF document text
    • https://euchebnici.com/img/file/sageruzulezisi.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/49593340421.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/31219054477.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/nazugilujudosazobivamik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=signalr+java+examplePDF 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_off0000b457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB457 16544 bytes
SHA-256: f5203c7feb84ce88fb51763929425f1508acc92b08a4f4d27bb5b4abe270e6b8
font_01_sfnt_off0000de4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF664 10580 bytes
SHA-256: 74bad8936ee25225795aa7927bdaf9aff6b615cd6e5a45504e4914ce00f39ce7