Malicious PDF — malware analysis report

Static analysis result for SHA-256 a74cb3900d10734b…

MALICIOUS

PDF

64.5 KB Created: 2020-03-09 08:42:12 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fd3f51cd568aaab2e2cf763071633104 SHA-1: 5ccb51acd63bfb81c2665174a93e8938953a5598 SHA-256: a74cb3900d10734ba03e6b1511b94816b7aa7d9caecfcbada62a8a8318cb2f74
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to PDF files hosted on various domains. The document body text mentions 'word to pdf converter offline software free download', suggesting a lure for users seeking software. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm designed to attract search engine traffic, likely leading to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://cqe8.brdge.org/uploads/1/3/0/2/130272342/130272342.html#word+to+pdf+converter+offline+software+free+download+full+version+for+pc
    • http://ohanaguidance.com/uploads/1/3/0/7/130740393/2185916.pdf
    • http://skunkremovalknoxville.com/uploads/1/3/0/6/130639424/lipuvo.pdf
    • http://hostmaster.allthingssweetandcandy.co.uk/uploads/1/3/0/4/130476143/judafe_petukogebujewos_xogafi_sasegog.pdf
    • http://madeinlarioja.com/uploads/1/3/0/4/130483249/wagejisalovajab.pdf
    • http://phhlca.org/uploads/1/3/0/8/130873771/lunavekixanetexitepu.pdf
    • http://claireleisringbuerkcounseling.com/uploads/1/3/0/5/130543771/213675.pdf
    • http://www.tolpig.com/uploads/1/3/0/6/130604742/bed8aa54.pdf
    • http://bunnystravel.com/uploads/1/3/0/7/130776421/fofufidebeseweju.pdf
    • http://mta-sts.marksmithillustration.com/uploads/1/3/0/6/130621917/lopovifekewabovag.pdf
    • http://berkeleyfpdocs.com/uploads/1/3/0/5/130588603/gomobekixenefe.pdf
    • http://recoveryzonetherapy.com/uploads/1/3/0/6/130639406/pukupolijirajo-tixunimutev.pdf
    • http://techhuntcomm.com/uploads/1/3/0/6/130605238/b12e549.pdf
    • http://ninigretstudios.com/uploads/1/3/0/6/130639304/xagojepimuwerepovul.pdf
    • http://lifethroughalens.org/uploads/1/3/0/6/130639891/nuwujuwu.pdf
    • http://thedivinealignment.net/uploads/1/3/0/5/130543166/funiziluzobe.pdf
    • http://ahigherplanegi.store/uploads/1/3/0/7/130740033/ad7e7.pdf
    • http://samsvcs.com/uploads/1/3/0/6/130604911/2386242.pdf
    • http://myresortwear.net/uploads/1/3/0/3/130323647/2534566.pdf
    • http://knockaroundllc.com/uploads/1/3/0/6/130620731/7184035.pdf
    • http://mta-sts.varonins.com/uploads/1/3/0/7/130740141/boweweje_gidodopufeka_posanis.pdf
    • http://www.emiliacyau.com/uploads/1/3/0/4/130476320/zobiba.pdf
    • http://divineemergence.com.au/uploads/1/3/0/6/130604408/teguwitatuwo-gukeroxarapidiz.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d149.bin
71370f22030a908e8f9e1f8542fc1a444611861c98bb4420b11ff1c2f7845975		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD149 8900 bytes

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