PDF malware analysis — malicious · d535f0df6680dac4

MALICIOUS

PDF

47.5 KB Created: 2020-05-26 03:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 32920c1cfbb3650be9eef4c1aa6ea1b7 SHA-1: 569d9c40b6afd8ee5aaa6eee8e5140b5146bb54e SHA-256: d535f0df6680dac46b8e017a6a50ae04851284a657e8ca5a1f10605587fe3df1

94 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 ML classifier also strongly indicated maliciousness. The document body contains text that appears to be metadata or corrupted content, but the primary malicious activity is the distribution of numerous URLs, likely to manipulate search engine results or redirect users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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://detailsinteriorpaintingburlington.com/uploads/1/3/0/3/130379173/130379173.html#national+geographic+troubled+waters
- http://corrinechristensen.com/uploads/1/3/0/4/130476039/sokur.pdf
- http://hrcilync.hrcom.com/uploads/1/3/1/6/131637679/sowewetasenap.pdf
- http://help.cmabroker.com/uploads/1/3/1/3/131384028/kufesipotevuda.pdf
- http://swabmasterwus.com/uploads/1/3/0/5/130540926/bofasumoviz-mewivujedi.pdf
- http://505waterfordpark.com/uploads/1/3/1/0/131069874/7ae90a9c97.pdf
- http://allanhovi.com/uploads/1/3/0/8/130813399/1816d6.pdf
- http://datasciencetitan.com/uploads/1/3/0/8/130874254/654664f0e3b3.pdf
- http://premierhomebuilders.net/uploads/1/3/0/6/130621601/9699816.pdf
- http://potatopants.org/uploads/1/3/0/7/130776088/e6a62687aceb3.pdf
- http://stevetaboga.com/uploads/1/3/0/6/130620280/fevurezavebidaxes.pdf
- http://bartechnics.com/uploads/1/3/1/3/131397964/9298814.pdf
- http://indulgencefacestudio.com/uploads/1/3/1/4/131406781/nenafu.pdf
- http://southcentralinspection.com/uploads/1/3/0/2/130270903/790b5cf02be4ba.pdf
- http://knoxversion.net/uploads/1/3/1/0/131070062/fa3c563c7ae038c.pdf
- http://mobile-care.info/uploads/1/3/0/2/130273843/sosogudave_vuwasusir_dadigel.pdf
- http://brittanyjreid.com/uploads/1/3/0/9/130969541/4242561206.pdf
- http://mta-sts.mail.kisyoga.com/uploads/1/3/1/1/131163638/2744545.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_off00007947.bin` `52733c963ce543af42aa054bd1b495885de237a3da42c865a2e3dc1531b8c532`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7947	10288 bytes
`font_01_sfnt_off00009cbb.bin` `c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9CBB	16204 bytes

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