Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf0b2bd3abd97e9d…

MALICIOUS

PDF

40.3 KB Created: 2020-03-30 02:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0e3efa4c3de37e4d5c0aed8161ac332c SHA-1: 55d6aeefc4e1dc95e1e2a2efdc0cb02a8c005cd0 SHA-256: bf0b2bd3abd97e9d551a4606346ee1911011b6ff498cb82a67b5528103924998
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 to other PDF files hosted on various domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. The ML classifier strongly supports the malicious verdict. No scripts were extracted, and the document body is heavily obfuscated, but the presence of numerous external links is the primary indicator of malicious intent.

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://somersetfoodtrail.org/uploads/1/3/0/6/130604653/130604653.html#definicion+de+inmoral+y+ejemplos
    • http://glenrockarboretum.org/uploads/1/3/0/5/130588824/sebiwilakaguf-lijopaw.pdf
    • http://oceannutrition.xyz/uploads/1/3/0/8/130873946/480d14b0b88.pdf
    • http://denalibasecamp.com/uploads/1/3/0/3/130324331/kikaj.pdf
    • http://www.alltechif.com/uploads/1/3/0/9/130969346/zukub-diwojetatupi-xasamerijal.pdf
    • http://omgfashionsjewelry.com/uploads/1/3/0/2/130272362/5028100.pdf
    • http://suedaniellicsw.com/uploads/1/3/0/7/130775724/kowigopak-vudeser-pixopat-todirugewovane.pdf
    • http://www.mahoneyhouse.com/uploads/1/3/0/6/130621942/fowimodozujizavon.pdf
    • http://expertmind.org/uploads/1/3/0/6/130621656/3170310.pdf
    • http://aanicarlton.com/uploads/1/3/0/5/130545021/lonadujibe-xizakobiwewe-muwujatod-walapudinepawit.pdf
    • http://oceanstatehandyman.com/uploads/1/3/0/2/130289476/c04f4f08.pdf
    • http://formerfattyfitness.com/uploads/1/3/0/4/130435667/putubufazapugisuf.pdf
    • http://timetoepic.com/uploads/1/3/0/5/130540026/xabulazalukuv.pdf
    • http://jamoral.com/uploads/1/3/0/7/130739260/lukakevepamib-sopogukesivopar-ranoderofa.pdf
    • http://ausaudio.net/uploads/1/3/1/3/131383751/01aef315af.pdf
    • http://kkspring.net/uploads/1/3/0/6/130604045/nebebesutume_kebow.pdf
    • http://lorcor.com/uploads/1/3/1/1/131163828/berubikagun-xemomi-falasejig-fatutapewesud.pdf
    • http://dynamicmotorsportsonline.com/uploads/1/3/0/4/130483318/1285158.pdf
    • http://howwemove.com/uploads/1/3/0/5/130588267/kosepiduberazebopu.pdf
    • http://topcv.ch/uploads/1/3/1/4/131408502/mafitum.pdf
    • http://publicschools305.org/uploads/1/3/0/7/130776760/ziluzijafaka.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_off00007534.bin
643d9c955cb625d2ee87d9b0cda1a2cdfb2c6fc71c14d9235f9211af0cf35782
pdf-font-stream PDF embedded font (sfnt) at offset 0x7534 7892 bytes