Malicious PDF — malware analysis report

Static analysis result for SHA-256 c70cc70eeb87048d…

MALICIOUS

PDF

70.0 KB Created: 2021-09-30 15:52:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: dc3ed40670eb6cbde9fd8bd51dbef986 SHA-1: 6e573a4ea0ce1563df6dc1fe36c7ffbc464095a4 SHA-256: c70cc70eeb87048d02c5119449c33c39ce7d5bc90187b8df36cb55255ae0ad53
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. The presence of numerous external URIs pointing to link farms on disposable domains suggests a malicious intent to redirect users to potentially harmful content. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://laborke.ru/uplcv?utm_term=fortnite+generator+skin+free PDF link annotation
    • https://peterdegendt.be/file/wijexola.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/jijilarikerokuviwowepubu.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/kasadopepukanekufif.pdfIn PDF document text
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/92840684426.pdfIn PDF document text
    • http://teresachild.com/upload/files/nunazebasevejapon.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/dumutorokusifopuf.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/vakafikede.pdfIn PDF document text
    • http://patchworkstudio.de/userfiles/file/60739120566.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/38876528958.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/vunulanekujuf.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/zavijijoneza.pdfIn PDF document text
    • http://wakabaeducation.com/userfiles/file/woteze.pdfIn PDF document text
    • http://7profi.net/userfiles/file/79290495349.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/20363644016.pdfIn PDF document text
    • https://tranthachcaodanang.thicongmaiche.com/uploads/image/files/31968382336.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/tofot.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/55845278876.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/93755892829.pdfIn PDF document text
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202109020253391727.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/fajodo.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/883be1cbecc250180ace852f95b460f5/gegarur.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7271c5832---44946675034.pdfIn PDF document text
    • http://selmanoglusigorta.com/userfiles/file/rafug.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://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_off0000b0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0CD 10412 bytes
SHA-256: bc622fb7eba3e141588d1458176232a4bca46a334c05dd1e6a3439f265cc7ebd
font_01_sfnt_off0000c886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC886 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE098 16720 bytes
SHA-256: 977da42c46b3922f98112a8caf9aa457a113fbf0b17dc29ec9e8819a5a7514a2