PDF malware analysis — malicious · 57e4eaf10e5e9835

MALICIOUS

PDF

122.7 KB Created: 2020-06-09 00:12:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: eafe1cdf5187f583c863010a5bfcf2eb SHA-1: 3accb33ed1989a1a419c2c373e207e565d20cccd SHA-256: 57e4eaf10e5e9835eb0ee177d5742954c4bd2ae8f85e2973bf7782a95575ff43

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The primary heuristic indicates these are external URIs, and the ML classifier strongly suggests maliciousness. The embedded URL http://plegendbeats.com/uploads/1/3/2/3/132302780/132302780.html#%25D9%2585%25D8%25A7+%25D9%2587%25D9%2588+%25D8%25A7%25D9%2584%25D8%25AA%25D9%258A%25D8%25B3%25D9%258A%25D8%25B1+%25D8%25A7%25D9%2584%25D9%2585%25D8%25B4%25D8%25AA%25D8%25B1%25D9%2583 is likely intended to redirect users to a malicious site for further exploitation.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

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://plegendbeats.com/uploads/1/3/2/3/132302780/132302780.html#%25D9%2585%25D8%25A7+%25D9%2587%25D9%2588+%25D8%25A7%25D9%2584%25D8%25AA%25D9%258A%25D8%25B3%25D9%258A%25D8%25B1+%25D8%25A7%25D9%2584%25D9%2585%25D8%25B4%25D8%25AA%25D8%25B1%25D9%2583
- http://beerloversguide.com.au/uploads/1/3/0/4/130483868/miwanomixibop_ligup_xoretokari_kaluwatoniwuma.pdf
- http://buggabeecollaborative.com/uploads/1/3/1/1/131163876/jevavuwu-jujoti-kuzowedop.pdf
- http://centerforstrategicministry.org/uploads/1/3/0/4/130476493/somajolipib_xapikurewe.pdf
- https://sewikurilego.files.wordpress.com/2020/06/xifewumejuxo.pdf
- https://gotexutag798502486.files.wordpress.com/2020/06/32386318637.pdf
- https://zuzujosu.files.wordpress.com/2020/06/gelimodoxikopasezope.pdf
- https://vewuzanifuwe.files.wordpress.com/2020/06/199612171.pdf
- https://filemukaxene293587401.files.wordpress.com/2020/06/nuwelixunigojizamobakoxu.pdf
- https://pevewedawisu.files.wordpress.com/2020/06/75212113125.pdf
- https://bilebapajaji.files.wordpress.com/2020/06/66442576167.pdf
- https://gitevudifu.files.wordpress.com/2020/06/ladowus.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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_003_off000181cb.bin` `353ae737777c8f39321cfd480a441284eae712284650a92ca6fcc0768743075c`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x181CB	33516 bytes
`font_01_sfnt_off0001bb28.bin` `16f4899ff38a080357b5bb7fe15bdc05a5064e82d1d1d68df84dd564a7d3d320`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1BB28	9708 bytes

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