Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f23020367ddb8f…

MALICIOUS

PDF

79.7 KB Created: 2021-09-09 11:09:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d7cf5f7c1af4167ba79bdbc9157dd0eb SHA-1: cf2b3d014850cc75c0c6fba8ae01bae5f2c31608 SHA-256: a1f23020367ddb8f52e8bd09914f88d42af4b305fd9bd3c215353ed115137f4d
146 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URIs pointing to potentially malicious or disposable domains. One URI, in particular, uses a raw IP address, increasing suspicion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://autosoftware.company/autoresponders_images/files/71560000308.pdf In PDF document text
    • http://www.contal-farmer.com/uploads/files/34036123256.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/2988975891.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/luturokisowotufagisewa.pdfIn PDF document text
    • http://infinity-c-t.com/userfiles/file/77393995262.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/sixulosi.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f22d386ce---rowug.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/89707396135.pdfIn PDF document text
    • http://shriramashramssschool.org/userfiles/file/66348430921.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/jeweselekeweju.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16131f60066d15---gosojavigupariv.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/kodovisijubelevaga.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/vufekuropubajapije.pdfIn PDF document text
    • https://xinpayflow.com/ckfinder/userfiles/files/46052788803.pdfIn PDF document text
    • https://camerabentrenet.camerabentre.vn/ckfinder/userfiles/files/wibow.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/91460652519.pdfIn PDF document text
    • http://americasbestwingspa.iorderfoods.com/uploads/files/55604755292.pdfIn PDF document text
    • https://invest.pl/userfiles/file/60268557999.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/vojugozejabovaxagepep.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/bizesag.pdfIn PDF document text
    • http://hansungidschool.com/userfiles/file/zimolobegiju.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394c7429ffe---virufu.pdfPDF link annotation
    • http://coreaad.com/DreamDataUpload/file/feninavudizuruko.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/gotizuxupekelofe.pdfIn PDF document text
    • https://dhrc.in/userfiles/file/binowomefub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=booting+android+into+recoveryPDF 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_off0000d3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB8 10564 bytes
SHA-256: 7b2aa9a97a0d8e6a15125d75b1ed96fd0d4d5a922a02da4cc94e34065b11ea0b
font_02_sfnt_off000103c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C9 17572 bytes
SHA-256: 6736b3622d965925764426d9cdab7cf740efb4daf6bfdac36a5c77c2cc992cd5