PDF malware analysis — malicious · 3e4b6f25c67a9382

MALICIOUS

PDF

127.7 KB Created: 2020-06-13 18:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: c546765ee7a9549f3f2f454172224e3f SHA-1: 0323af15a8763a45d6df2614fc9aa1c815efb1b7 SHA-256: 3e4b6f25c67a9382cf3af805b2504994255c582cd737907e809928a23e15e1ff

94 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by a machine learning classifier with high confidence. It contains a large number of external links, many of which point to numeric slugs on various domains, indicating a link farm or SEO abuse tactic. One of the primary URLs extracted is http://cornish.business-facebook-covid19.com/uploads/1/3/1/3/131398138/131398138.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. This pattern suggests the document is designed to lure users to external sites, likely for malicious purposes such as phishing or malware delivery.

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://cornish.business-facebook-covid19.com/uploads/1/3/1/3/131398138/131398138.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://artigianatocelticomedhelan.com/uploads/1/3/1/3/131379622/3713446.pdf
- http://pondsludgeremoval.com/uploads/1/3/0/4/130435786/308787.pdf
- http://808computertricks.com/uploads/1/3/0/5/130588924/kubig.pdf
- http://jlwedding.com/uploads/1/3/1/4/131454012/xorizoxenileg.pdf
- http://sgrimo.org/uploads/1/3/0/6/130605119/630591.pdf
- http://parkerdancecompany.net/uploads/1/3/0/7/130739287/d85d856d83b31a9.pdf
- http://thisoklahome.com/uploads/1/3/0/4/130491599/495807.pdf
- https://xuvisoje.files.wordpress.com/2020/06/woxutumaxefurawuwumelili.pdf
- https://pagexitedajo.files.wordpress.com/2020/06/dorak.pdf
- https://zawimig643626223.files.wordpress.com/2020/06/36577407552.pdf
- https://sojuwupetibo.files.wordpress.com/2020/06/dalat.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_off0001953c.bin` `b5ac0e4f4b3132a79ec4b5fa47e88527c0db5b640c17f5f4143c60c5bcaf118a`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1953C	35176 bytes
`font_01_sfnt_off0001d196.bin` `d90d627740e4b75ba1cb73b7c0140fd08e9ff48538b461a443d7b4e5a130353a`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1D196	9068 bytes

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