PDF malware analysis — malicious · 736facac6e88e39e

MALICIOUS

PDF

44.6 KB Created: 2020-03-26 14:12:20 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)

MD5: a2e4f68a93ddff84a0b8f94f1e3327ef SHA-1: b82b0f9488ae4b9afdb63f9e67eb68215eb9b4f0 SHA-256: 736facac6e88e39e1b427491770f0981dff86805e8c0c315bfd6d115642c3e3b

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded URLs, many of which point to similarly structured PDF files on various domains. This suggests a link farm or SEO poisoning tactic designed to drive traffic to potentially malicious content. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a mass external PDF link farm.

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://cinderellascleaningcompany.com/uploads/1/3/1/1/131163666/131163666.html#caracter%C3%ADsticas+do+transformador+de+pot%C3%AAncia
- http://www.impkidz.com/uploads/1/3/0/5/130589270/ad3c33d5.pdf
- http://speedlore.com/uploads/1/3/0/5/130544131/1a553186a671.pdf
- http://tairuabackpackers.com/uploads/1/3/0/6/130620314/jutexupe.pdf
- http://royalematch.com/uploads/1/3/0/7/130740209/jumajejomexo.pdf
- http://largeandpage.com/uploads/1/3/0/4/130436202/namoradalukexuw.pdf
- http://albums.brandannunzio.com/uploads/1/3/0/4/130476743/beteril.pdf
- http://mugshotmodels.net/uploads/1/3/0/5/130588624/7101002.pdf
- http://ciumontreal.com/uploads/1/3/0/8/130873971/4112443.pdf
- http://artculturevs.org/uploads/1/3/0/3/130323755/bae28a0e7529.pdf
- http://greencleanservicesinc.net/uploads/1/3/0/6/130605216/9bafe6.pdf
- http://lwmdtest.com/uploads/1/3/0/6/130639965/181736.pdf
- http://thesimplechristian.com/uploads/1/3/0/4/130491356/045227f92c.pdf
- http://mindfulnessforteensaustin.com/uploads/1/3/0/7/130740062/wexawa.pdf
- http://auburndalle.com/uploads/1/3/0/6/130640101/tilakapida-mifulu-wodurub-kekokozelek.pdf
- http://thememeoutlet.com/uploads/1/3/0/4/130483805/pomefakaseniv.pdf
- http://lifeopenbook.com/uploads/1/3/1/0/131070992/2472815.pdf
- http://homecareinlacanada.net/uploads/1/3/0/8/130813710/9269220.pdf
- http://alexandermead.com/uploads/1/3/0/7/130775756/dd3ea3d3e.pdf
- http://shelleyscleaning.services/uploads/1/3/1/3/131381046/53799c.pdf
- http://zombiehousetv.com/uploads/1/3/0/5/130541733/literenijerog.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.

Filename	Kind	Source	Size
`font_00_sfnt_off00008063.bin` `6434af837531ca1329fd32a27aa6b0d74d7f32a9621c7776b093a8b77626414d`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8063	10564 bytes

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