Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c613d734cf64d45…

MALICIOUS

PDF

82.2 KB Created: 2021-09-12 11:11:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9bd955a05dda185b67757b692d9d813c SHA-1: f99b2c1afcf3a484e22af693ebb5f3510edcbe30 SHA-256: 2c613d734cf64d4554a7e2918d61e6297e4bf660d4dfe6a888f248635b14add3
186 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URIs, including one pointing to a raw IP address, and is described as a link farm on disposable hosting. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document's purpose is to trick users into decrypting or accessing a password-protected archive, likely containing a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 https://optical-axis.com/uploads/files/202109110134041474.pdf In PDF document text
    • http://mnarch.it/userfiles/files/29034306871.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/6671888961.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/59709911645.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/61047752203.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210911_152805.pdfPDF link annotation
    • http://taeguektour.com/FileData/ckfinder/files/20210904_270C4D6CFCA8714F.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/fivusuramudu.pdfIn PDF document text
    • http://fxmeat.com/upload/file/98099d6a14847d147be8033cd965602c.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/16465091589.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/21107163608.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/laputodadidozuse.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/78409329183.pdfIn PDF document text
    • http://onlinevay.com/upload/files/83426605045.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161393fa77eaeb---xorebudolegale.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/3248773875.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/58442661760.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/53304462142.pdfIn PDF document text
    • http://marienoellebermond.com/img/uploaded/file/domikebezudesaje.pdfIn PDF document text
    • http://maulich.vn/attachment/files/saxejiwimewowe.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/73648082248.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/81bfc22ba8149b2e7444fb79fa0f61e0/lutujilewerokopiwutu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=droid+vpn+premium+2020PDF 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_off0000dd78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD78 10488 bytes
SHA-256: 55431c0cc5d9aa0bb118c7ff7631e0b6acacf4ce3198fb4c3f942d9d381b7598
font_01_sfnt_off0000f53b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53B 17588 bytes
SHA-256: 4d861b4e4207bd1a722379cad325e551fa523a4b7582df4adc575136f1207307
font_02_sfnt_off00012332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12332 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1