Malicious PDF — malware analysis report

Static analysis result for SHA-256 56a74936639483cb…

MALICIOUS

PDF

57.7 KB Created: 2020-03-07 10:50:34 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1f89288fe6c6b067c30da035355da0cc SHA-1: cb65dc45f75b0801cb71e3836584d2a4a2c31b46 SHA-256: 56a74936639483cb2bdb0665f03ca89a76539213a950619a4a28a9494c538edb
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, a technique often used for SEO poisoning or to redirect users to malicious sites. The document body, though heavily obfuscated, contains text related to a 'Pulmonary angiography procedure ppt' and references the wkhtmltopdf tool, suggesting a lure. The PDF_SEO_LINK_FARM heuristic firing confirms the presence of a link farm, indicating a likely attempt to drive traffic to potentially compromised or malicious web pages.

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://abbeys-family.rominastiebenphotography.com/uploads/1/3/0/2/130289171/130289171.html#pulmonary+angiography+procedure+ppt
    • http://www.show-case-pss.be/uploads/1/3/0/7/130739038/dd8bb08.pdf
    • http://awesomebuysforyou.com/uploads/1/3/0/8/130874110/1217685.pdf
    • http://naonaprestige.com/uploads/1/3/0/7/130739141/sixoduvubixifu.pdf
    • http://ohanarestocafe.com/uploads/1/3/0/2/130270738/tepavuzopetibiwafag.pdf
    • http://hilltopkeyclub.org/uploads/1/3/0/5/130542717/64c9e480d0ed38.pdf
    • http://5thconstructionservicesinc.net/uploads/1/3/0/2/130272629/dananiveregefe_xokofo.pdf
    • http://mackboats.net/uploads/1/3/0/7/130776344/57cdddca7d0b5f0.pdf
    • http://granvillewinery.com/uploads/1/3/0/6/130640066/2547459.pdf
    • http://sophiecorbelet.com/uploads/1/3/0/5/130551668/teputebet.pdf
    • http://baigoftricksentertainment.com/uploads/1/3/0/6/130605104/lenogasimuvope-lisupu-sefubo.pdf
    • http://www.netfuntime.com/uploads/1/3/0/3/130313272/dudod.pdf
    • http://www.rosegardenalachua.com/uploads/1/3/0/3/130312974/554d67dc.pdf
    • http://www.theorionballroom.com/uploads/1/3/0/6/130622061/nigugipidagu.pdf
    • http://www.contemporarypossibilitiesjolie.com/uploads/1/3/0/6/130639720/gojamut.pdf
    • http://pandttech.com/uploads/1/3/0/7/130776823/vameg.pdf
    • http://adgermanwarehouse.com/uploads/1/3/0/6/130640033/tafegalijit-xajofaz-nolorat-widekotu.pdf
    • http://kubecom.com/uploads/1/3/0/4/130436431/vapobur.pdf
    • http://pattiannsjourney.com/uploads/1/3/0/5/130551534/bbcb615185.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.

FilenameKindSourceSize
font_00_sfnt_off0000b9ef.bin
fbb0ca97e289a4f8435631f5c3aad1472a2ff32c44e2fba132a48a96ffb7545c
pdf-font-stream PDF embedded font (sfnt) at offset 0xB9EF 8040 bytes