Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1f83720272898bf…

MALICIOUS

PDF

35.9 KB Created: 2020-05-14 01:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 09f71c98c13c9022a6b228e7b03557a1 SHA-1: 7c69e3cc3196fd54ef2eb596da40e5098f149a76 SHA-256: f1f83720272898bf8034d084e9aeaa3a34f8f5fff121638c29b0954a2374368d
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains references to medical terms and the wkhtmltopdf application, suggesting a lure document. The primary purpose appears to be directing users to a vast network of linked PDFs hosted on various domains, likely for SEO poisoning or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://ewaveinc.com/uploads/1/3/0/7/130775398/130775398.html#lesion+del+nervio+ciatico+mayor+pdf
    • http://migllc1.com/uploads/1/3/1/3/131398101/fb01f2dc54df7e.pdf
    • http://cantamagliapropertyservices.com/uploads/1/3/0/4/130436180/zezosofivo.pdf
    • http://brightsidehealth.org/uploads/1/3/0/7/130740113/widuxele.pdf
    • http://www.burgersonmedia.musicatozpodcast.com/uploads/1/3/1/3/131380021/6468966.pdf
    • http://solarmidnight.com/uploads/1/3/0/7/130776712/rabemibof.pdf
    • http://mcirclemedia.com/uploads/1/3/0/8/130874207/bodoji_gesan.pdf
    • http://crime-science.com/uploads/1/3/0/6/130620912/komitivubaw_xureremenevi_jorusomajujuk.pdf
    • http://womeninbusinessatcampo.com/uploads/1/3/1/4/131407367/6610592.pdf
    • http://texastradingtreasures.com/uploads/1/3/1/4/131438667/5559d.pdf
    • http://eqdogs.com/uploads/1/3/0/6/130604771/sokujegufonamerupevu.pdf
    • http://gyrocity.net/uploads/1/3/0/9/130969758/wafafop_sasupitod.pdf
    • http://andersoncarpetinc.com/uploads/1/3/1/3/131380120/158cd7184.pdf
    • http://neuenhausglass.com/uploads/1/3/0/5/130544591/mopogovusafit-vetimuvavotopid-papen.pdf
    • http://aidenwiselove.com/uploads/1/3/0/7/130775503/tomugida_wumegu.pdf
    • http://thehelpinghandsprojectthailand.org/uploads/1/3/1/3/131383514/51cf660.pdf
    • http://southerncharmyardart.net/uploads/1/3/0/4/130478566/a01202e09.pdf
    • http://kellypick.com/uploads/1/3/1/4/131437850/e9603c2299fff7.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_off000060a1.bin
66daaa172a621a232ae0b4597bb6a81c294b7245be90fe5ffb77c9758566a24d
pdf-font-stream PDF embedded font (sfnt) at offset 0x60A1 10432 bytes