PDF malware analysis — malicious · ec6a694edf8b8de7

MALICIOUS

PDF

49.0 KB Created: 2020-04-07 03:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)

MD5: fc3354bac18188ee6b790a79d92eeba7 SHA-1: 8e66fa600abee410ecba25fb7f16d27d153c91f8 SHA-256: ec6a694edf8b8de736b678b6a948abe88c71b8e2de9215bbdbd0259e5eecaf4d

94 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The document body contains text related to LED lighting calculations and mentions wkhtmltopdf, suggesting it might be a lure document. The primary attack pattern involves directing users to numerous external URLs, likely for SEO spam or to host further 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://estatesale.guide/uploads/1/3/0/8/130813798/130813798.html#calculo+de+iluminacion+led+interior
- http://catalyst-movement.com/uploads/1/3/0/7/130775723/42d7ab33.pdf
- http://daytonbathrenovations.com/uploads/1/3/0/5/130551375/gutopebovoruwu.pdf
- http://genslcr.com/uploads/1/3/0/5/130539021/3144110.pdf
- http://queenslandlutherangiving.org/uploads/1/3/0/8/130813787/85af46b9453b2.pdf
- http://morgancountywpr.com/uploads/1/3/0/3/130323602/2406763.pdf
- http://johorswimming.org/uploads/1/3/1/1/131164079/wodexinulefev_kosufotijama.pdf
- http://soontechdevelopmentlimited.com/uploads/1/3/1/4/131438788/gowajulofu.pdf
- http://thatright.com/uploads/1/3/0/6/130621216/7675010.pdf
- http://asapserviceexperts.com/uploads/1/3/0/2/130273748/4135718.pdf
- http://kofc11415.org/uploads/1/3/0/3/130379380/8ccc124ab190.pdf
- http://opengiusergroup.com/uploads/1/3/1/4/131452858/majufewitasut_vijotavaluwu.pdf
- http://inspirewellness.ca/uploads/1/3/0/4/130435638/2ebdbabeeb.pdf
- http://tuckerlevinllp.com/uploads/1/3/0/9/130969329/gokamepiteva-nafaje-nopujotujiwe.pdf
- http://envythebrand.com/uploads/1/3/0/4/130490668/neniletifo.pdf
- http://fabrichippieblog.com/uploads/1/3/0/6/130605462/xupevobujarutizaka.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
`font_00_sfnt_off00008005.bin` `64959469ffc74c88f68bbf29820b7409e6e4f6e50ddc4241906bbd6874a9fb1f`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8005	9208 bytes
`font_01_sfnt_off0000a12f.bin` `f31c439e28d0137206b91a151f21343900f846ed9ff070250fbe82eb1cc7da1d`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xA12F	16204 bytes

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