PDF malware analysis — malicious · 4bcaa88e29ec0a5b

MALICIOUS

PDF

42.1 KB Created: 2020-04-06 06:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)

MD5: 207128828945099ebbaea7e25168d6e5 SHA-1: decaf9ff8512e6744254330dd94ea529098ee07b SHA-256: 4bcaa88e29ec0a5b2d9eb8c4a09f01484c147f440ff84548e1763624127773de

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 to other PDFs hosted on various domains, indicative of a link farm or SEO poisoning attack. The ML classifier strongly flagged this PDF as malicious. The document body, though partially corrupted, contains text related to calculus and mentions wkhtmltopdf, suggesting it might be a lure document generated by a tool.

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://sixtarubio.com/uploads/1/3/1/3/131381658/131381658.html#formulas+basicas+de+integracion+calculo+integral
- http://streetefam.com/uploads/1/3/0/4/130489417/c6b2a7067127.pdf
- http://mygodsway.com/uploads/1/3/0/5/130551487/jovutu-nikulasebuj-bunibejifezojem.pdf
- http://deafmountainyoga.com/uploads/1/3/1/4/131452969/e04691.pdf
- http://youthfulskindoctor.com/uploads/1/3/1/1/131164479/a279608083ddcd.pdf
- http://makerspaceretreat.com/uploads/1/3/0/4/130489023/60af74d7b3222bd.pdf
- http://lutropics.com/uploads/1/3/0/3/130323185/pugemarakotitas-sajufenawe-nusujama.pdf
- http://prodizies.com/uploads/1/3/0/6/130622093/6367874.pdf
- http://spiaaprd.org/uploads/1/3/1/3/131380263/kujubuvupel.pdf
- http://thesepiamarketplace.com/uploads/1/3/1/0/131071157/kutavufi-zomeb.pdf
- http://morrisadvofit.com/uploads/1/3/0/7/130738989/lariled_zisezamu.pdf
- http://chandlerbreeart.com/uploads/1/3/0/8/130874165/gujexuxisidekarexu.pdf
- http://demorestaurant.club/uploads/1/3/0/7/130738972/2027176.pdf
- http://browsmithmbc.com/uploads/1/3/0/4/130489241/wujipomer-kafavegowugu-lakipadowamazad.pdf
- http://mpgtrucking.com/uploads/1/3/0/6/130621601/pilemawopokise-ponakufelevuw.pdf
- http://assurancepolygraph.org/uploads/1/3/0/4/130489649/vevagu_memoxotixe_kamexiv_zifux.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_off00006c4e.bin` `5bf77fd1fb2312f8c9cf41ef550a3b3c734bd2f1c52f4f322f6743243c303104`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6C4E	9480 bytes
`font_01_sfnt_off00008ef0.bin` `b0b81acf99f867ec01b12aaa7df2cf8e0a204e4f33d939d80d206132c728d5e5`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8EF0	2740 bytes

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